Lexus Car ES, IS, LS 1998-06

3.3L V6 - Auto 2

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Trouble Code: P0121



TP Sensor or TP Switch 'A' Signal Range/Performance

Possible Causes:



TP sensor signal circuit open or shorted to ground (intermittent)
 
TP sensor is loose at it mounting or the throttle is binding
 
TP sensor is damaged or has failed (perform a sweep test)
 
PCM has failed
 

Trouble Code: P0134



Air Fuel Sensor 1 (Bank 1 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks present in the PCV valve, hoses or hose connections
 
A/FS1 connector is damaged or loose
 
A/FS1 signal circuit is open or shorted to ground
 
A/FS1 is damaged, contaminated or it has failed
 
Fuel Control component faults (sticking injector, low pressure)
 
Gas leaks in the exhaust system in front of the Oxygen sensor
 
PCM has failed
 

Trouble Code: P0135



Air Fuel Sensor 1 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



A/FS1 heater control circuit is open or shorted to ground
 
A/FS1 heater control circuit is shorted to power
 
A/FS1 heater power circuit is open (check power from relay)
 
A/FS1 heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0136



HO2S-12 (Bank 1 Sensor 2) Circuit Malfunction

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S signal circuit shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 

Trouble Code: P0150



HO2S-21 (Bank 2 Sensor 1) Circuit Malfunction

Possible Causes:



HO2S signal circuit is open between the sensor and the PCM
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S is damaged, contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0153



HO2S-21 (B2 S1) Slow Response

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S element is contaminated, or HO2S heater has failed
 
Intake air leaks, exhaust manifold leaks or PCV system leaks
 
MAF sensor out of calibration (it may be dirty or contaminated)
 

Trouble Code: P0154



Air Fuel Sensor 2 (Bank 2 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks present in the PCV valve, hoses or hose connections
 
A/FS1 connector is damaged or loose
 
A/FS1 signal circuit is open or shorted to ground
 
A/FS1 is damaged, contaminated or it has failed
 
Fuel Control component faults (sticking injector, low pressure)
 
Gas leaks in the exhaust system in front of the Oxygen sensor
 

Trouble Code: P0155



HO2S-21 (B2 S1) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater control circuit is shorted to power
 
HO2S heater power circuit is open (check power from the relay)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel System Too Lean (Bank 1)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel system supplying too little fuel during cruise or idle (faulty fuel pump or fuel filter)
 
Fuel injector (one or more) dirty or pressure regulator has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0172



Fuel System Too Rich (Bank 1)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 

Trouble Code: P0174



Fuel System Too Lean (Bank 2)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter)
 
Fuel injector (one or more) dirty or pressure regulator has failed
 
MAF sensor is contaminated, out-of-calibration or damaged
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0175



Fuel System Too Rich (Bank 2)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects two or more cylinders
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects two or more cylinders (e.g., contaminated, dirty or sticking fuel injectors)
 
Ignition system fault (coil or plug) that affects several cylinders
 
Mass airflow meter is contaminated, or its signal is out of range
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 1
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 1 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 2
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 2 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 2
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 3
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 3 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 3
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 4
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 4 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Trouble Code: P0306



Cylinder 6 Misfire Detected

Trouble Code: P0330



Knock Sensor 2 Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or VREF
 
Knock sensor is damaged, not tightened properly or has failed
 
PCM has failed
 

Trouble Code: P0339



Crankshaft Position Sensor 'A' Circuit Intermittent

Possible Causes:



CKP sensor signal circuit is open, shorted to ground or power
 
CKP Sensor signal ground circuit is open
 
Crankshaft timing pulley is damaged or out of alignment
 
CKP Sensor has failed, or the PCM has failed
 

Trouble Code: P0345



Camshaft Position Sensor 'A' Signal Range/Performance

Possible Causes:



VVT sensor signal circuit is open, shorted to ground or power
 
VVT sensor pulley is damaged, or timing belt has jumped teeth
 
VVT sensor has failed, or the PCM has failed
 

Trouble Code: P0346



Camshaft Position Sensor 'A' Signal Range/Performance

Possible Causes:



VVT sensor signal circuit is open, shorted to ground or power
 
VVT sensor pulley is damaged, or timing belt has jumped teeth
 
VVT sensor had failed, or the PCM has failed
 

Trouble Code: P0351



Ignition Coil No. 1 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT1 circuit is open or shorted to ground
 
Ignition Coil No. 1 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil No. 2 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT2 circuit is open or shorted to ground
 
Ignition Coil No. 2 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil No. 3 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT3 circuit is open or shorted to ground
 
Ignition Coil No. 3 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil No. 4 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT4 circuit is open or shorted to ground
 
Ignition Coil No. 4 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil No. 5 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT5 circuit is open or shorted to ground
 
Ignition Coil No. 5 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil No. 6 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT6 circuit is open or shorted to ground
 
Ignition Coil No. 6 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0430



Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Catalytic converter is damaged, contaminated or has failed
 
Front A/FS or rear HO2S is contaminated with fuel or moisture
 
Front A/FS or the rear HO2S is loose in its mounting hole
 
Front A/FS is older (aged) than the rear HO2S (HO2S is lazy)
 
Gas leaks at the exhaust manifold or in the exhaust pipes
 

Trouble Code: P0511



Idle Control Valve Circuit Malfunction

Possible Causes:



IAC valve connector is damaged or loose
 
IAC valve control circuit is open, shorted to ground or power
 
IAC valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P0513



Unmatched Key Code Detected

Possible Causes:



An unmatched ignition key was inserted
 

Trouble Code: P0705



A/T Range Sensor Circuit (PRNDL) Malfunction

Possible Causes:



Park/Neutral switch assembly is shorted
 
Park/Neutral switch assembly is damaged or has failed
 
PCM has failed.
 

Trouble Code: P0717



A/T Input Shaft Speed Sensor 'A' Circuit No Signal

Possible Causes:



Direct clutch connector is damaged (it may be open or shorted)
 
Direct clutch sensor signal circuit is open or shorted
 
Direct clutch speed sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0724



A/T Torque Converter Clutch Shift Solenoid Performance

Possible Causes:



Lockup clutch solenoid is damaged or has failed* Shift solenoid SL is damaged or has failed (mechanical fault)
 
Shift solenoid SL is stuck in "on" or "off" position
 
Valve body is blocked or stuck
 

Trouble Code: P0743



A/T Torque Converter Clutch Shift Solenoid Circuit Malfunction

Possible Causes:



Shift solenoid SL connector is damaged or loose
 
Shift solenoid SL control circuit is open or shorted to ground
 
Shift solenoid SL is damaged or has failed (electrical fault)
 
PCM has failed
 

Trouble Code: P0751



A/T Shift Solenoid 'A' Signal Range/Performance

Possible Causes:



SSA control circuit is open or shorted to ground
 
SSA control circuit is shorted to system power (B+)
 
SSA is damaged or has failed (an electrical fault)
 
PCM has failed
 

Trouble Code: P0756



A/T Shift Solenoid 'B' Signal Range/Performance

Possible Causes:



SSB control circuit is open, shorted to ground or to power (B+)
 
SSB is damaged or has failed (an electrical fault)
 
PCM has failed
 

Trouble Code: P0758



A/T Shift Solenoid 'B' Circuit Malfunction

Possible Causes:



SSB control circuit is open, shorted to ground or to power (B+)
 
SSB is damaged or has failed (an electrical fault)
 
PCM has failed
 

Trouble Code: P0850



A/T Park/Neutral Switch Circuit Malfunction

Possible Causes:



Park/Neutral switch assembly is shorted*Park/Neutral switch assembly is damaged or has failed
 
PCM has failed.
 

 
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