Lexus GS, SC 1998-06

4.0L V8 VIN H Auto 1

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4.0L V8 VIN H Auto

Trouble Code: P2A00



Air Fuel Sensor (Bank 1 Sensor 1) Signal Slow Response

Possible Causes:



A/F sensor connector is damaged or loose
 
A/F sensor circuit is open or shorted, or the sensor has failed
 
A/F sensor heater is damaged or has failed
 
A/F sensor heater relay circuit is open or the relay has failed
 
Fuel delivery component has failed (fuel pressure regulator, one or more fuel injectors is leaking or severely restricted)
 
Induction system problems (air leaks or restricted air filter)
 
PCM has failed
 

Trouble Code: P0031



Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Low Code

Possible Causes:



HO2S-11 heater control circuit is open
 
HO2S-11 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0032



Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit High Input

Possible Causes:



HO2S-11 heater control circuit is shorted to ground
 
HO2S-11 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0037



Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Low Input

Possible Causes:



HO2S-12 heater control circuit is open
 
HO2S-12 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0038



Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit High Input

Possible Causes:



HO2S-12 heater control circuit is shorted to ground
 
HO2S-12 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0051



Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Low Input

Possible Causes:



HO2S-21 heater control circuit is open
 
HO2S-21 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0052



Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit High Input

Possible Causes:



HO2S-21 heater control circuit is shorted to ground
 
HO2S-21 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0057



Heated Oxygen Sensor (Bank 2 Sensor 2) Heater Circuit Low Input

Possible Causes:



HO2S-22 heater control circuit is open
 
HO2S-22 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0058



Heated Oxygen Sensor (Bank 2 Sensor 2) Heater Circuit High Input

Possible Causes:



HO2S-22 heater control circuit is shorted to ground
 
HO2S-22 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0100



Mass Airflow Sensor Circuit Malfunction

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor ground circuit is open between sensor and ground
 
MAF sensor power circuit is open (check the power to the relay)
 
MAF sensor has failed, or the PCM has failed
 

Trouble Code: P0101



Mass Airflow Sensor Signal Range/Performance

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0102



Mass Airflow Sensor Circuit Low Input

Possible Causes:



MAF sensor signal circuit is open or shorted to ground
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0103



Mass Airflow Sensor Circuit High Input

Possible Causes:



MAF sensor signal circuit is shorted to power
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0112



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



IAT sensor connector is damaged (it may be shorted internally)
 
IAT sensor ground circuit is shorted to ground
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0113



Intake Air Temperature Sensor Circuit High Input

Possible Causes:



IAT sensor connector is damaged (it may be open internally)
 
IAT sensor ground circuit is open
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0115



Engine Coolant Temperature Sensor Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open, shorted to ground or VREF
 
ECT sensor ground circuit is open between sensor and ground
 
ECT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0116



Engine Coolant Temperature Sensor Range/Performance

Possible Causes:



Check for a low coolant level or an incorrect coolant mixture
 
ECT sensor signal circuit or ground circuit has high resistance
 
ECT sensor is contaminated, damaged or out-of-calibration
 
PCM has failed
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



ECT sensor signal circuit is shorted to ground
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0120



TP Sensor or Switch 'A' Circuit Malfunction

Possible Causes:



TP sensor signal circuit is open or shorted to ground
 
TP sensor ground circuit is open, or the power circuit is open
 
TP sensor is damaged or has failed
 

Trouble Code: P0121



Throttle Pedal Position Sensor Switch 'A' Signal Range/Performance

Possible Causes:



TP sensor connector is damaged or it is open
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0122



Throttle Pedal Position Sensor/Switch 'A' Circuit Low Input

Possible Causes:



Throttle control motor and sensor unit is damaged or failed
 
TP sensor VC (VREF) circuit is open, or the VTA1 signal circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0123



Throttle Pedal Position Sensor/Switch 'A' Circuit High Input

Possible Causes:



Throttle control motor and sensor unit is damaged or failed
 
TP sensor VC (VREF) circuit is shorted to the VTA1 circuit
 
VTA1 ground circuit is open or the VTA1 signal circuit is open
 
PCM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed Loop:

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P0130



HO2S-11 (Bank 1 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 signal circuit is shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) 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: P0134



HO2S-11 (Bank 1 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks present in the PCV valve, hoses or hose connections
 
Fuel Control component faults (sticking injector, low pressure)
 
Gas leaks in the exhaust system in front of the Oxygen sensor
 
HO2S connector is damaged or loose
 
HO2S signal circuit is open or shorted to ground
 
HO2S is damaged, contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) 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: P0136



HO2S-12 (Bank 1 Sensor 2) Circuit Malfunction Code

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: P0141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Possible Causes:



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



HO2S-21 (Bank 2 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks present in the PCV valve, hoses or hose connections
 
Fuel Control component faults (sticking injector, low pressure)
 
Gas leaks in the exhaust system in front of the Oxygen sensor
 
HO2S-21 signal circuit is open or shorted to ground
 
HO2S-21 is damaged, contaminated or it has failed
 
PCM has failed
 

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: P0156



HO2S-22 (Bank 2 Sensor 2) 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
 

Trouble Code: P0161



HO2S-22 (B2 S2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open, shorted to ground or 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: P0220



Throttle Pedal Position Sensor/Switch 'B' Circuit Malfunction

Possible Causes:



TP sensor signal circuit open or shorted to ground
 
TP sensor ground circuit is open
 
TP sensor power circuit is open (check VREF circuit at PCM)
 
TP sensor is damaged or has failed
 
PCM has failed
 

 
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