Subaru Car 1998-05

2.0L H4 - Std 1

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2.0L H4 - Std

Trouble Code: P0030



HO2S Heater Control Circuit Bank 1 Sensor 1

Possible Causes:



Check harness between ECM and front oxygen sensor connector
 
Check harness between main relay and front oxygen sensor connector
 
Check front oxygen sensor
 
Check poor contact
 

Trouble Code: P0031



HO2S Heater Control Circuit Low Bank 1 Sensor 1

Possible Causes:



Check power supply to front oxygen sensor
 
Check ground circuit for ECM
 
Using a scan tool check current data
 
Check output signal of ECM
 
Check front oxygen sensor
 

Trouble Code: P0032



HO2S Heater Control Circuit High Bank 1 Sensor 1

Possible Causes:



Check output signal of ECM
 
Check front oxygen sensor heater current
 
Check output signal of ECM
 

Trouble Code: P0037



HO2S Heater Control Circuit Low Bank 1 Sensor 2

Possible Causes:



Check power supply to rear oxygen sensor
 
Check ground circuit for ECM
 
Using a scan tool check current data
 
Check output signal of ECM
 
Check rear oxygen sensor
 

Trouble Code: P0038



HO2S Heater Control Circuit High Bank 1 Sensor 2

Possible Causes:



Check input signal of ECM
 
Using a scan tool check current data
 
Check poor contact
 

Trouble Code: P0068



MAP/MAF- Throttle Position Correlation

Possible Causes:



Check idle switch signal
 
Check any other DTC on display
 
Check condition of the sensor
 
Check condition of the throttle body
 

Trouble Code: P0102



Mass or Volume Air Flow Circuit Low Input

Possible Causes:



Using a scan tool, check current data
 
Check input signal of ECM
 
Check power supply to sensor
 
Check harness between ECM and sensor connector
 
Check poor contact
 

Trouble Code: P0103



Mass or Volume Air Flow Circuit High Input

Possible Causes:



Using a scan tool, check current data
 
Check harness between ECM and sensor connector
 

Trouble Code: P0107



Manifold Absolute pressure/Barometric Pressure Circuit Low Input

Possible Causes:



Using a scan tool, check current data
 
Check poor contact
 
Check output signal of ECM
 
Check input signal of ECM
 
Check harness between ECM and sensor connector
 

Trouble Code: P0108



Manifold Absolute pressure/Barometric Pressure Circuit Low Input

Possible Causes:



Check output signal of ECM
 
Check input signal of ECM
 
Check harness between ECM and sensor connector
 
Check harness between the sensor connector
 
Check poor contact
 

Trouble Code: P0111



Intake Air Temperature Circuit Range/Performance

Possible Causes:



Check any other DTC on display
 
Check engine coolant temperature
 

Trouble Code: P0112



Intake Air Temperature Circuit Low Input

Possible Causes:



Using a scan tool, check current data
 
Check the harness between the sensor and the ECM connector
 

Trouble Code: P0113



Intake Air Temperature Circuit high Input

Possible Causes:



Using a scan tool, check current data
 
Check the harness between the sensor and the ECM connector
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



Using a scan tool, check current data
 
Check harness between sensor and ECM connector
 

Trouble Code: P0118



Engine Coolant Temperature Sensor Circuit High Input

Possible Causes:



Using a scan tool, check current data
 
Check harness between sensor and ECM connector
 

Trouble Code: P0122



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

Possible Causes:



Check sensor output
 
Check poor contact
 
Check harness between ECM and electronic throttle control (if equipped)
 

Trouble Code: P0123



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

Possible Causes:



Check sensor output
 
Check poor contact
 
Check harness between ECM and electronic throttle control (if equipped)
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed loop Fuel Control

Possible Causes:



Check any other DTC on display
 
Check tire size
 
Check engine coolant
 
Check thermostat
 

Trouble Code: P0129



Barometric Pressure Too Low

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0130



O2 Sensor Circuit Bank 1 Sensor 1

Possible Causes:



Check any other DTC on display
 
Using a scan tool, check current data
 
Check harness between ECM and sensor
 
Check exhaust system
 

Trouble Code: P0133



O2 Sensor Circuit Slow Response Bank 1 Sensor 1

Possible Causes:



Check any other DTC on display
 
Check exhaust system
 

Trouble Code: P0134



O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1

Possible Causes:



Check harness between ECM and sensor connector
 
Check poor contact
 

Trouble Code: P0137



O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

Possible Causes:



Check any other DTC on display
 
Using the a scan tool, check current data
 
Check Harness between ECM and rear oxygen sensor connector
 
Check exhaust system
 

Trouble Code: P0138



O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Possible Causes:



Check any other DTC on display
 
Using a scan tool, check current data
 
Check Harness between ECM and rear oxygen sensor connector
 
Check exhaust system
 

Trouble Code: P0139



O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Possible Causes:



Check any other DTC on display
 
Check Harness between ECM and rear oxygen sensor connector
 
Check sensor
 

Trouble Code: P0171



System To Lean Bank 1

Possible Causes:



Check any other DTC on display
 
Check exhaust system
 
Check air intake system
 
Check fuel pressure
 
Check fuel injector
 
Check coolant temperature
 
Check intake manifold pressure sensor
 
Check intake air temperature sensor
 

Trouble Code: P0172



System To Rich Bank 1

Possible Causes:



Check any other DTC on display
 
Check exhaust system
 
Check air intake system
 
Check fuel pressure
 
Check fuel injector
 
Check coolant temperature
 
Check intake manifold pressure sensor
 
Check intake air temperature sensor
 

Trouble Code: P0181



Fuel Temperature Sensor -A- Circuit Range/Performance

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0182



Fuel Temperature Sensor -A- Circuit Low Input

Possible Causes:



Using a scan tool, check data
 

Trouble Code: P0183



Fuel Temperature Sensor -A- Circuit High Input

Possible Causes:



Using a scan tool, check data
 
Check harness between sensor and ECM connector
 

Trouble Code: P0244



Turbocharger/Supercharger Wastegate Solenoid -A- Range/Performance

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0245



Turbocharger/Supercharger Wastegate Solenoid -A- Low

Possible Causes:



Check output signal from ECM
 
Check harness between wastegate control solenoid valve and ECM connector
 
Check poor contact
 
Check wastegate control solenoid valve
 
Check power supply to wastegate control solenoid valve
 
Check poor contact
 

Trouble Code: P0246



Turbocharger/Supercharger Wastegate Solenoid -A- High

Possible Causes:



Check output signal from ECM
 
Check harness between wastegate control solenoid valve and ECM connector
 
Check poor contact
 
Check wastegate control solenoid valve
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Check any other DTC on display
 
Check output signal of ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 
Check power supply to mass air flow sensor
 
Check harness between ECM and sensor connector
 
Check installation of camshaft and crankshaft sensors
 
Check crank plate
 
Check condition of timing chain
 
Check fuel level
 
Check status of MIL light
 
Check air intake system
 
Check cause of misfire (engine running)
 
Check engine condition
 
Check all cylinders individually, in pairs, in groups and at random
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Check any other DTC on display
 
Check output signal of ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 
Check power supply to mass air flow sensor
 
Check harness between ECM and sensor connector
 
Check installation of camshaft and crankshaft sensors
 
Check crank plate
 
Check condition of timing chain
 
Check fuel level
 
Check status of MIL light
 
Check air intake system
 
Check cause of misfire (engine running)
 
Check engine condition
 
Check all cylinders individually, in pairs, in groups and at random
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Check any other DTC on display
 
Check output signal of ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 
Check power supply to mass air flow sensor
 
Check harness between ECM and sensor connector
 
Check installation of camshaft and crankshaft sensors
 
Check crank plate
 
Check condition of timing chain
 
Check fuel level
 
Check status of MIL light
 
Check air intake system
 
Check cause of misfire (engine running)
 
Check engine condition
 
Check all cylinders individually, in pairs, in groups and at random
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Check any other DTC on display
 
Check output signal of ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 
Check power supply to mass air flow sensor
 
Check harness between ECM and sensor connector
 
Check installation of camshaft and crankshaft sensors
 
Check crank plate
 
Check condition of timing chain
 
Check fuel level
 
Check status of MIL light
 
Check air intake system
 
Check cause of misfire (engine running)
 
Check engine condition
 
Check all cylinders individually, in pairs, in groups and at random
 

Trouble Code: P0327



Knock Sensor 1 Circuit Low Input Bank 1 or Single Sensor

Possible Causes:



Check harness between sensor and ECM connector
 
Check sensor
 
Check sensor installation
 

Trouble Code: P0328



Knock Sensor 1 Circuit High Input Bank 1 or Single Sensor

Possible Causes:



Check harness between sensor and ECM connector
 
Check sensor
 
Check input signal of ECM
 

Trouble Code: P0335



Crankshaft Position Sensor -A- Circuit

Possible Causes:



Check harness between the sensor and the ECM connector
 
Check condition of the sensor
 
Check the sensor
 

 
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