Honda_Passport_1997-2002

TroubleCodes (5 of 6)

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3.2L V6 - Std



Trouble Code: P0448

EVAP Vent Solenoid Circuit Malfunction (Shorted)

Trouble Code Conditions: Engine started, engine running, system voltage from 11-16v, and the PCM detected an unexpected "low" voltage condition on the EVAP Vent solenoid control circuit with the solenoid commanded "off".

Possible Causes:



Vent solenoid control circuit is shorted to chassis ground
 
Vent solenoid power circuit is open (check the ENGINE fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed (the solenoid driver circuit is damaged)
 

Trouble Code: P0452

Fuel Tank Pressure Sensor Circuit Low Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Fuel Tank Pressure (FTP) sensor signal was less than 0.20v for 12.5 seconds, 100 test failures over a 200 test period during the CCM test.

Possible Causes:



FTP sensor signal circuit is shorted to ground
 
FTP sensor power circuit is open between sensor and the PCM
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0453

Fuel Tank Pressure Sensor Circuit High Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Fuel Tank Pressure (FTP) sensor signal was more than 4.98v for 12.5 seconds, 100 test failures over a 200 test period in the CCM test.

Possible Causes:



FTP sensor signal circuit is open between sensor and the PCM
 
FTP sensor ground circuit open between the sensor and PCM
 
FTP sensor signal circuit is shorted to VREF or system power
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0456

EVAP System Very Small Leak (0.020") Detected

Trouble Code Conditions: DTC P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0452 and P0453 codes set, BARO sensor more than 70 kPa, system voltage at 11-16v, engine speed under 1200 rpm, VSS indicating less than 5 mph, fuel tank level from 40-80%, throttle angle below 1.1%, VSS over 65 mph, and the PCM detected a vacuum decay condition that indicated the presence of a very small leak (under 0.020" in diameter) somewhere in the system.

Possible Causes:



Canister Purge solenoid is damaged, leaking or has failed
 
EVAP purge or vent solenoid is damaged or has failed
 
Fuel filler cap loose, cross-threaded, incorrect part or damaged
 
Fuel tank is cracked (leaking), or a leak exists in the 'O' ring
 
Fuel tank pressure sensor is damaged or has failed
 
Fuel vapor line(s), fuel pipes or hoses damaged or leaking
 
PCM has failed
 

Trouble Code: P0461

Fuel Level Sensor Circuit Range/Performance

Trouble Code Conditions: Engine started, engine running, fuel tank level from 15-85%, Fuel Tank Level Slosh Test and Fuel Level Main Test both completed, fuel tank data is valid, and the PCM detected the fuel level did not change over a distance of 62.2 miles during the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



Fuel level signal circuit is open, shorted to ground or to power
 
Fuel tank empty or overfull (fuel sender is stuck mechanically)
 
Wrong fuel gauge is installed, or instrument panel is damaged
 
Fuel gauge sender unit is damaged or has failed
 
PCM has failed
 

Trouble Code: P0462

Fuel Level Sensor Circuit Low Input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Fuel Level sensor signal was less than 0.39v for 20 seconds during the test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



Fuel level signal circuit is shorted to ground
 
Wrong fuel gauge is installed, or instrument panel is damaged
 
Fuel gauge sender unit is damaged or has failed
 
PCM has failed
 

Trouble Code: P0463

Fuel Level Sensor Circuit High input

Trouble Code Conditions: Key on or engine running, and the PCM detected the Fuel Level sensor signal was less than 2.90v for 20 seconds during the test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



Fuel level signal circuit is open or shorted to system power (B+)
 
Wrong fuel gauge is installed, or instrument panel is damaged
 
Fuel gauge sender unit is damaged or has failed
 
PCM has failed
 

Trouble Code: P0464

Fuel Level Sensor Circuit Malfunction (Noisy)

Trouble Code Conditions: DTC P0461, P0462 and P0463 not set, fuel level over 3%, IAT sensor signal more than 40ºF, engine running, and the PCM detected an unexpected "noisy" condition on the Fuel level sensor circuit during the CCM Rationality test.

Possible Causes:



Fuel level sensor signal circuit open (an intermittent fault)
 
Fuel level sensor signal circuit shorted to power (intermittent)
 
Fuel level sensor damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P0502

Vehicle Speed Sensor Circuit Low Input

Trouble Code Conditions: Engine started, engine speed from 1800-2500, system voltage from 11-16v, ECT sensor more than 140ºF, throttle angle from 10-40%, engine load over 50%, and the PCM did not detect any VSS signals for 12.5 seconds over a 15 second period during the CCM test.

Possible Causes:



VSS signal circuit is open or shorted to ground
 
VSS power circuit is open (check the Meter 10A fuse)
 
VSS ground circuit is open between the sensor and ground
 
VSS is damaged or has failed, or the VSS rotor is cracked
 
PCM has failed
 

Trouble Code: P0506

Idle Air Control System Low RPM

Trouble Code Conditions: DTC P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0200-206, P0300, P0301-P306, P0335, P0341, P0342, P0404, P0405, P0440, P0442, P0446, P0452, P0453, P0502, P0507, P0601, P0602, P0705, P1133, P1404 and P1441 not set, engine runtime over 125 seconds, system voltage from 11-16v, ECT sensor more than 122ºF, IAT sensor more than -40ºF, MAP sensor less than 40 kPa, Purge duty cycle over 10%, BARO sensor over 75 kPa, vehicle speed less than 2 mph with the throttle closed, and the PCM detected the Actual speed was 100-200 rpm below the Desired idle speed for 10 seconds based on the current engine coolant temperature.

Possible Causes:



High resistance between the IAC 'A' high or low control circuits
 
Short to ground between the IAC 'B' high or low control circuits
 
IAC valve is damaged, dirty, sticking or has failed
 
The throttle plate is carbon fouled (it may need to be cleaned)
 

Trouble Code: P0507

Idle Air Control System High RPM

Trouble Code Conditions: DTC P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0201-206, P0300, P0301-P0306, P0335, P0341, P0342, P0404, P0405, P0440, P0442, P0446, P0452, P0453, P0502, P0507, P0601, P0602, P0705, P1133, P1404 and P1441 not set, engine runtime over 125 seconds, system voltage from 11-16v, ECT sensor more than 122ºF, IAT sensor more than -40ºF, MAP sensor less than 40 kPa, Purge duty cycle over 10%, BARO sensor over 75 kPa, vehicle speed under 2 mph with the throttle closed, and the PCM detected the Actual speed was 100-200 rpm above the Desired idle speed for 10 seconds based on the current engine coolant temperature.

Possible Causes:



High resistance between the IAC 'A' high or low control circuits
 
Short to ground between the IAC 'B' high or low control circuits
 
IAC valve is damaged, dirty, sticking or has failed
 
The throttle plate is carbon fouled (it may need to be cleaned)
 

Trouble Code: P0562

System Voltage Low Input

Trouble Code Conditions: Engine started, engine runtime over 15 minutes, and the PCM detected the system voltage was less than 11.5v in the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



Check the drive belt for excessive wear and the proper tension
 
Check for high resistance at the battery connections or at the starter solenoid connection that connects to PCM power circuit
 
Check the generator output and the battery condition
 

Trouble Code: P0563

System Voltage High Input

Trouble Code Conditions: Engine started, engine runtime over 15 minutes, and the PCM detected the system voltage was more than 16.0v in the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



Check the generator output and the battery condition
 

Trouble Code: P0565

Cruise Control Main Switch Circuit Malfunction

Trouble Code Conditions: Engine started, engine running, system voltage from 11-16v, and the PCM detected noise from Cruise Control (C/C) main switch contacts 60 times within one second, or the C/C main switch remained "on" for 15 seconds during the CCM Rationality test.

Possible Causes:



C/C main switch signal circuit is shorted to ground
 
C/C main switch signal circuit is shorted to another circuit
 
C/C main switch is damaged or has failed
 

Trouble Code: P0566

Cruise Control Cancel Switch Circuit Malfunction

Trouble Code Conditions: Engine started, engine running, system voltage from 11-16v, and the PCM detected noise from Cruise Control (C/C) cancel switch contacts 100 times within 1.6 seconds, or the C/C cancel switch remained "on" for 40 seconds during the CCM Rationality test.

Possible Causes:



C/C cancel switch signal circuit is shorted to ground
 
C/C cancel switch signal circuit is shorted to another circuit
 
C/C cancel switch is damaged or has failed
 

Trouble Code: P0567

Cruise Control Resume Switch Circuit Malfunction

Trouble Code Conditions: Engine started, engine running, system voltage from 11-16v, and the PCM detected noise from Cruise Control (C/C) resume switch contacts 100 times within 1.6 seconds, or the C/C resume switch remained "on" for 50 seconds during the CCM Rationality test.

Possible Causes:



C/C resume switch signal circuit is shorted to ground
 
C/C resume switch signal circuit is shorted to another circuit
 
C/C resume switch is damaged or has failed
 

Trouble Code: P0568

Cruise Control Set Switch Circuit Malfunction

Trouble Code Conditions: Engine started, engine running, system voltage from 11-16v, and the PCM detected noise from Cruise Control (C/C) set switch contacts 100 times within 1.6 seconds, or the C/C set switch remained "on" for 120 seconds during the CCM Rationality test.

Possible Causes:



C/C set switch signal circuit is shorted to ground
 
C/C set switch signal circuit is shorted to another circuit
 
C/C set switch is damaged or has failed
 

Trouble Code: P0571

Brake Light Switch Circuit Malfunction

Trouble Code Conditions: DTC P0502 not set, engine started, then driven to a speed of over 12.5 mph, and the PCM detected that two (2) brake switch signals did not agree with the brake switch status during the CCM test.

Possible Causes:



Brake switch signal circuit is open between switch and the PCM
 
Brake switch signal circuit is shorted to ground
 
Brake switch power circuit open between switch and 15A fuse
 
Check the battery condition (it may have failed)
 

Trouble Code: P0601

PCM Internal Check Sum Error

Trouble Code Conditions: Key on, and the PCM detected a check sum error had occurred during its initial self-test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



The contents of the EEPROM have changed
 
PCM needs to be replaced and reprogrammed to repair this trouble code
 

Trouble Code: P0602

PCM Programming Error

Trouble Code Conditions: Key on or engine cranking, and the PCM detected that it was not programmed properly. Note: A failure record is stored when this trouble code is set.

Possible Causes:



PCM must be replaced and then reprogrammed to repair this trouble code
 

Trouble Code: P0604

PCM Random Access Memory Error

Trouble Code Conditions: Key on, and the PCM detected inconsistencies between the Main CPU and the Watchdog CPU software calibration Note: A failure record is stored when this trouble code is set.

Possible Causes:



PCM must be replaced and then reprogrammed to repair this trouble code
 

Trouble Code: P0606

PCM Internal Performance Error

Trouble Code Conditions: Key on, and the PCM detected inconsistencies between the Main CPU and the Watchdog CPU software calibration Note: A failure record is stored when this trouble code is set.

Possible Causes:



PCM must be replaced and then reprogrammed to repair this trouble code
 

Trouble Code: P1106

MAP Sensor Circuit High Input (Intermittent)

Trouble Code Conditions: DTC P0121, P0122 and P0123 not set, engine runtime 10 seconds, engine speed less than 1000 rpm with throttle angle less than 3%, or the engine speed is more than 1000 rpm with the throttle angle less than 10%, and the PCM detected an unexpected high value (over 80 kPa) on the MAP sensor circuit for 5 seconds of a 16 second period. Note: For additional help with this code, view the Failure Records.

Possible Causes:



MAP sensor signal circuit is open (an intermittent fault)
 
MAP sensor signal circuit shorted to ground (intermittent fault)
 
MAP sensor VREF circuit is open or shorted to ground
 
MAP sensor is damaged or has failed
 

Trouble Code: P1107

MAP Sensor Circuit Low Input (Intermittent)

Trouble Code Conditions: DTC P0121, P0122, P0123 not set, engine running, engine speed less than 1000 rpm and throttle angle over 1%, or the engine speed more than 1000 rpm and throttle angle more than 2%, and the PCM detected an unexpected low value (below 11 kPa) on the MAP sensor circuit for 5 seconds of a 16 second period. Note: For additional help with this code, view the Failure Records.

Possible Causes:



MAP sensor signal circuit is open (an intermittent fault)
 
MAP sensor signal circuit shorted to ground (intermittent fault)
 
MAP sensor VREF circuit is open or shorted to ground
 
MAP sensor is damaged or has failed
 

Trouble Code: P1111

IAT Sensor Circuit High Input (Intermittent)

Trouble Code Conditions: Engine started, engine runtime over 4 minutes, ECT sensor more than 140ºF, vehicle speed under 20 mph, MAF sensor less than 20 g/sec, and the PCM detected an unexpected high signal of over 4.90v (Scan Tool reads -38ºF) on the IAT sensor circuit for 2.5 seconds over a 25 second period during the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



IAT sensor signal circuit is open (an intermittent fault)
 
IAT sensor is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1112

IAT Sensor Circuit Low Input (Intermittent)

Trouble Code Conditions: Engine started, engine runtime over 4 minutes, ECT sensor more than 140ºF, vehicle driven to a speed of over 20 mph, Calculated airflow less than 20 g/sec, and the PCM detected an unexpected low voltage condition of less than 0.10v (Scan Tool reads 298ºF) on the IAT sensor circuit for 2.5 seconds over a 25 second period. Note: For additional help with this code, view the Failure Records.

Possible Causes:



IAT sensor signal circuit is shorted to ground (intermittent fault)
 
IAT sensor is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1114

ECT Sensor Circuit Low Input (Intermittent)

Trouble Code Conditions: Engine started, engine runtime more than 1 minute, and the PCM detected an unexpected low voltage condition of less than 0.10v (Scan Tool read 302ºF) on the ECT sensor circuit for 10 seconds of a 100 second period. Note: For additional help with this code, view the Failure Records.

Possible Causes:



ECT sensor signal circuit shorted to ground (intermittent fault)
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1115

ECT Sensor Circuit High Input (Intermittent)

Trouble Code Conditions: Engine started, engine running for 1 minute, and the PCM detected an unexpected high voltage of over 4.90v (Scan Tool reads -38ºF)] on the ECT sensor circuit for 10 seconds of a 100 second period. Note: For additional help with this code, view the Failure Records.

Possible Causes:



ECT sensor signal circuit is open (an intermittent fault)
 
ECT sensor is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1120

Throttle Position Sensor 1 Circuit Malfunction

Trouble Code Conditions: Key on or engine running, and the PCM detected the TP Sensor 1 (TP1) circuit indicated less than 2.5%, or more than 97.5% for 93.6 ms or for 18 tests out of 500 test samples during the CCM test.

Possible Causes:



TP1 sensor signal circuit is open between the sensor and PCM
 
TP1 sensor signal circuit is grounded between sensor and PCM
 
TP1 sensor VREF circuit is open between sensor and the PCM
 
TP1 sensor is damaged or has failed
 

Trouble Code: P1121

Throttle Position Sensor Intermittent High Input

Trouble Code Conditions: Engine started, engine running for 5 seconds, and the PCM detected an unexpected high signal of over 4.90v on the TP sensor circuit for 0.15 seconds of a 1.5 second period during the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



TP sensor signal circuit is open between the sensor and PCM
 
TP sensor ground circuit is open between the sensor and PCM
 
TP sensor signal circuit is shorted to VREF or system power
 
TP sensor is damaged or has failed
 

Trouble Code: P1122

Throttle Position Sensor Intermittent Low Input

Trouble Code Conditions: Engine running, and the PCM detected an unexpected low signal of less than 0.22v on the TP sensor circuit for 0.15 seconds over a 1.5 second period during the CCM test. Note: For additional help with this code, view the Failure Records.

Possible Causes:



TP sensor signal circuit is shorted to ground
 
TP sensor VREF circuit shorted to ground (test other sensors)
 
TP sensor is damaged or has failed
 

Trouble Code: P1125

Electronic Throttle Control Limit Performance Mode

Trouble Code Conditions: Key on or engine running, and the PCM detected the TP Sensor 1 (TP1) circuit indicated less than 2.5%, or more than 97.5% for 18 counts out of 500 test samples during the CCM Rationality test.

Possible Causes:



TP sensor signal circuit is open between the sensor and PCM
 
TP sensor signal circuit is grounded between sensor and PCM
 
TP sensor VREF circuit is open between sensor and the PCM
 
TP sensor is damaged or has failed
 

Trouble Code: P1133

HO2S-11 (Bank 1 Sensor 1) Insufficient Switching

Trouble Code Conditions: DTC P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0300, P0301-P0306, P0441 and P1441 not set, engine speed from 1500-3000 rpm in closed loop for 1 minute, system voltage from 11-16v, ECT sensor more than 122ºF, MAF sensor from 9-42 g/sec, Purge duty cycle over 2%, conditions met for 3 seconds, and the PCM detected less than 23 rich-to-lean or lean-to-rich switches on the HO2S-11 signal circuit.

Possible Causes:



Air leaks after the MAF sensor, or in the EGR or PCV system
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
 
Fuel injector (one or more) dirty, leaking or sticking
 
Fuel pressure regulator leaking, damaged or has failed
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P1134

HO2S-11 (Bank 1 Sensor 1) Transition Time Ratio Error

Trouble Code Conditions: DTC P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0300, P0441 and P1441 not set, system voltage from 10-16v, engine speed from 1500-3000 rpm in closed loop for 1 minute, ECT sensor more than 122ºF, Calculated airflow from 9-42 g/sec, Purge duty cycle over 2%, conditions met for 3 seconds, then 90 seconds after entering closed loop control, the PCM detected the transition time ratio to switch from lean-to-rich or rich to lean from the HO2S-11 was below 0.8 or over 3.8 during the Oxygen Sensor Monitor test.

Possible Causes:



Air leaks at the exhaust manifold or exhaust pipes
 
HO2S signal circuit is open or shorted to ground (intermittent)
 
HO2S heater power circuit is open, or the heater has failed
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 

Trouble Code: P1153

HO2S-21 (Bank 2 Sensor 1) Insufficient Switching

Trouble Code Conditions: DTC P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0300, P0301-P0306, P0441 and P1441 not set, system voltage from 11-16v, engine speed from 1500-3000 rpm in closed loop for 1 minute, ECT sensor more than 122-167ºF, MAF sensor from 9-42 g/sec, Purge duty cycle over 2%, conditions met for 3 seconds, and the PCM detected less than 27 rich-to-lean or lean-to-rich switches on the HO2S-21 signal circuit in the Oxygen Sensor Monitor test.

Possible Causes:



Air leaks after the MAF sensor, or in the EGR or PCV system
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
 
Fuel injector (one or more) dirty, leaking or sticking
 
Fuel pressure regulator leaking, damaged or has failed
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P1154

HO2S-21 (Bank 2 Sensor 1) Transition Time Ratio

Trouble Code Conditions: DTC P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0300, P0301-P0306, P0441 and P1441 not set, system voltage from 10-16v, engine speed from 1500-3000 rpm in closed loop for 1 minute, ECT sensor more than 122-167ºF, MAF sensor from 9-42 g/sec, Purge duty cycle over 2%, conditions met for 3 seconds, then 90 seconds after entering closed loop control, the PCM detected the transition time ratio to switch from lean-to-rich or rich to lean from the HO2S-21 was less than 0.44 or more than 3.8 during the test.

Possible Causes:



Air leaks at the exhaust manifold or exhaust pipes
 
HO2S signal circuit is open or shorted to ground (intermittent)
 
HO2S heater power circuit is open, or the heater has failed
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 

Trouble Code: P1163

Lean A/F Sensor (Bank 1 Sensor 1) Slow Response

Trouble Code Conditions: Engine at idle speed, then accelerated to 55 mph for 5 seconds, then back to idle speed for 5 seconds, and the PCM detected the LAF sensor response time was too slow, or that the R-L or L-R switch rate was too slow during the HO2S Monitor test period.

Possible Causes:



LAF sensor may be contaminated or may have failed
 
Fuel supply system is too lean (exhaust leaks in front of LAF)
 
Fuel supply system is too rich (fuel filter is clogged or dirty)
 
PCM has failed
 

Trouble Code: P1164

Lean A/F Sensor (Bank 1 Sensor 1) Range/Performance

Trouble Code Conditions: Engine speed over 1500 rpm in 4th gear in closed loop, then a quick acceleration to WOT, followed by a 5 second deceleration period with the throttle closed, and the PCM detected a problem in the LAF sensor response time, or that the rich-to lean or lean-to rich switch rate was too slow during the test.

Possible Causes:



LAF sensor may be contaminated or may have failed
 
Fuel supply system is too lean (exhaust leaks in front of LAF)
 
Fuel supply system is too rich (fuel filter is clogged or dirty)
 
PCM has failed
 

Trouble Code: P1165

Lean A/F-11 (Bank 1 Sensor 1) Range/Performance

Trouble Code Conditions: Vehicle driven at an engine speed of 1500-2500 rpm at 45-60 mph for 2-3 minutes, followed by a deceleration period of 3 seconds back to idle speed with the throttle closed, and the PCM detected the LAF sensor signal was too high or too low during the HO2S Monitor test.

Possible Causes:



LAF signal circuit is open or grounded (intermittent fault)
 
LAF signal circuit is shorted to heater power (intermittent)
 
LAF may be contaminated or may have failed
 
PCM has failed
 

Trouble Code: P1167

Fuel System Rich During Decel Fuel Cutoff (Bank 1)

Trouble Code Conditions: No related codes set, ECT sensor signal more than 140ºF, engine running in Power Enrichment mode in closed loop for 3 seconds, and the PCM detected the HO2S-11 signal was more than 600 mv in a Decel Fuel Cutoff period during the Fuel System Monitor test.

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injectors (one or more) leaking, pressure regulator leaking
 
HO2S is contaminated, deteriorated or it has failed
 

 
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