Subaru Forester 1998-05

2.5L H4 VIN 6 Auto 1

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2.5L H4 VIN 6 Auto

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: P0065



Air Assisted Injector Control Range/Performance

Possible Causes:



Check any other DTC on display
 
Check air assist injector solenoid valve operation
 
Check air by-pass hoses
 
Check fuel injector
 

Trouble Code: P0066



Air Assisted Injector Control Circuit or Circuit Low

Possible Causes:



Check output signal from ECM
 
Check power supply to air assist injector solenoid valve
 
Check harness between ECM and air assist injector solenoid valve connector
 
Check poor contact
 

Trouble Code: P0067



Air Assisted Injector Control Circuit High

Possible Causes:



Check input signal from ECM
 
Check output signal from ECM
 

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: P0101



Mass or Volume Air Flow Circuit Range/Performance

Possible Causes:



Check any other DTC on display
 

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: P0106



Pressure Sensor Circuit Range/Performance

Possible Causes:



Check any other DTC on display
 
Check air intake system
 
Check pressure sensor
 
Check throttle position
 

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: P0116



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



Check harness between sensor and 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: P0128



Coolant Temperature Thermostat (coolant temperature below thermostat regulating temperature)

Possible Causes:



Check vehicle
 
Check any other DTC on display
 
Check engine coolant
 
Check radiator fan
 

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: P0131



O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Possible Causes:



Check harness between ECM and sensor
 

Trouble Code: P0132



O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Possible Causes:



Check harness between ECM and sensor
 

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: P0135



Front Oxygen Sensor 1 (RH) Heater Circuit Malfunction

Possible Causes:



Check any other DTC on display (P0141 and P0147)
 
Using a scan tool, check current data
 
Check output signal from ECM
 
Check front oxygen sensor 1 (RH)
 

Trouble Code: P0136



Rear Oxygen Sensor Circuit Malfunction

Possible Causes:



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

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: P0141



Rear Oxygen Sensor Heater Circuit Malfunction

Possible Causes:



Check output signal from ECM
 
Check power supply to sensor
 
Check sensor
 

Trouble Code: P0170



Fuel Trim Malfunction

Possible Causes:



Check exhaust system
 
Check air intake system
 
Check fuel pressure
 
Check engine coolant
 
Check mass air flow sensor
 

Trouble Code: P0171



System Too 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 Too 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
 

 
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