Subaru Forester 1998-05

2.5L H4 VIN 6 Auto 2

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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: P0261



Fuel Injector Circuit Low Input No. 1

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 

Trouble Code: P0262



Fuel Injector Circuit High Input No. 1

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check any other DTC on display
 
Using a scan tool, check current data
 
Check air intake system
 
Check for misfire
 

Trouble Code: P0264



Fuel Injector Circuit Low Input No. 2

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 

Trouble Code: P0265



Fuel Injector Circuit High Input No. 2

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check any other DTC on display
 
Using a scan tool, check current data
 
Check air intake system
 
Check for misfire
 

Trouble Code: P0267



Fuel Injector Circuit Low Input No. 3

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 

Trouble Code: P0268



Fuel Injector Circuit High Input No. 3

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check any other DTC on display
 
Using a scan tool, check current data
 
Check air intake system
 
Check for misfire
 

Trouble Code: P0270



Fuel Injector Circuit Low Input No. 4

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 

Trouble Code: P0271



Fuel Injector Circuit High Input No. 4

Possible Causes:



Check output signal from ECM
 
Check harness between injector and ECM connector
 
Check any other DTC on display
 
Using a scan tool, check current data
 
Check air intake system
 
Check for misfire
 

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: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



Check harness between knock sensor 1 and ECM connector
 
Check sensor
 
Check input signal of ECM
 

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
 

Trouble Code: P0336



Crankshaft Position Sensor -A- Circuit range/Performance

Possible Causes:



Check any other DTC on display
 
Check condition of the sensor
 
Check the crankshaft plate
 
Check timing chain
 

Trouble Code: P0340



Camshaft Position Sensor -A- Circuit Bank 1 or Single Sensor

Possible Causes:



Check any other DTC on display
 
Check power supply
 
Check harness between sensor connector and ECM
 
Check sensor installation and condition
 
Check the sensor
 
Check for poor contact
 

Trouble Code: P0341



Camshaft Position Sensor -A- Circuit Range/Performance Bank 1 or Single Sensor

Possible Causes:



Check any other DTC on display
 
Check harness between sensor connector and ECM
 
Check sensor installation and condition
 
Check the sensor
 
Check the cam sprocket
 
Check the installation and condition of the timing belt
 

Trouble Code: P0400



Exhaust Gas Recirculation Flow Malfunction

Possible Causes:



Check any other DTC on display
 
Check EGR control solenoid valve circuit
 
Check vacuum line
 
Check EGR system
 

Trouble Code: P0410



Secondary Air Injection System

Possible Causes:



Check air pump operation
 
Check duct between pump and combination valve
 
Check power supply to pump
 
Check harness between pump relay and pump connector
 
Check pump relay
 
Check pump relay power source
 
Check harness between ECM and pump relay connector
 

Trouble Code: P0420



Catalyst System Efficiency Below Threshold Bank 1

Possible Causes:



Check any other DTC on display
 
Check harness between ECM and rear oxygen sensor connector
 
Check exhaust system
 

Trouble Code: P0440



Evaporative Emission Control System Malfunction

Possible Causes:



Check fuel filler cap
 
Check fuel filler pipe packing
 
Check purge control valve solenoid
 
Check evaporative emission control system line
 
Check canister
 
Check fuel tank
 
Check any other mechanical components in the evaporative control system
 

Trouble Code: P0441



Evaporative Emission Control System Indirect Purge Flow

Possible Causes:



Check any other DTC on display
 
Check purge control valve solenoid operation
 
Check purge control valve
 

Trouble Code: P0442



Evaporative Emission Control System Leak Detected (small leak)

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check fuel filler pipe packing
 
Check the drain valve
 
Check the purge control solenoid valve
 
Check the pressure control solenoid valve
 
Check evaporative emission control system line
 
Check canister
 
Check fuel tank
 
Check any other mechanical components in the evaporative control system
 

Trouble Code: P0443



Evaporative Emission Control System Purge Control Valve Circuit Low Input

Possible Causes:



Check output signal from ECM
 
Check harness between purge control solenoid valve and ECM connector
 
Check the purge control solenoid valve
 
Check power supply to purge control solenoid valve
 
Check evaporative emission control system line
 
Check poor contact
 

Trouble Code: P0445



Evaporative Emission Control System Purge Control Valve Circuit High Input

Possible Causes:



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

Trouble Code: P0447



Evaporative Emission Control System Purge Control Valve Circuit High Input

Possible Causes:



Check output signal from ECM
 
Check poor contact
 
Check harness between drain valve and ECM connector
 
Check drain valve
 
Check power supply to drain valve
 

Trouble Code: P0448



Evaporative Emission Control System Vent Control Circuit Shorted

Possible Causes:



Check input signal from ECM
 
Check poor contact
 
Check harness between drain valve and ECM connector
 
Check drain valve
 

Trouble Code: P0452



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Using a scan tool, check current data
 
Check power supply to fuel tank pressure sensor
 
Check input signal to ECM
 
Check harness between ECM and coupling connector in rear wiring harness
 
Check fuel tank cord
 
Check the purge control solenoid valve
 
Check poor contact
 

Trouble Code: P0453



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Using a scan tool, check current data
 
Check power supply to fuel tank pressure sensor
 
Check input signal to ECM
 
Check harness between ECM and coupling connector in rear wiring harness
 
Check fuel tank cord
 
Check poor contact
 
Check harness between ECM and fuel tank pressure sensor connector
 

Trouble Code: P0456



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check fuel filler pipe packing
 
Check drain valve
 
Check purge control solenoid valve
 
Check pressure control solenoid valve
 
Check harness between ECM and fuel tank pressure sensor connector
 
Check evaporative emission control system line
 
Check canister
 
Check any other mechanical component in the system
 

Trouble Code: P0457



Evaporative Emission Control System Leak Detected

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check fuel filler pipe packing
 
Check drain valve
 
Check purge control solenoid valve
 
Check pressure control solenoid valve
 
Check canister
 
Check fuel tank
 
Check any other mechanical component in the system
 

Trouble Code: P0458



Evaporative Emission System Purge Control Valve Circuit Low

Possible Causes:



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

 
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