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Subaru Forester Fault Codes


You can find common Subaru Forester fault codes on this page that when clicked take you to a detailed description.

You can also type in the fault code you are getting below to find a more detailed description.

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Do you know the fault code already? Enter it in the box below and hit "Search Codes".

Subaru Forester Recalls

When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.

You can check to see if your Subaru Forester has any recall notices on our sister site AutoRecalls.co, sorted by model year.

View Subaru Forester Recalls »
Recall Notice Icon
Severity Icon 7/10

Error Icon P0420

Catalyst System Efficiency Below Threshold (Bank 1)

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Severity Icon 9/10

Error Icon P0700

Transmission Control System Malfunction

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Error Icon P0028

Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)

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Severity Icon 6/10

Error Icon P0026

Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)

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Severity Icon 8/10

Error Icon P0302

Cylinder 2 Misfire Detected

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Severity Icon 7/10

Error Icon P0171

System Too Lean (Bank 1)

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Severity Icon 8/10

Error Icon P0113

Intake Air Temperature Circuit High Input

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Error Icon P0971

Pressure Control Solenoid C Control Circuit High

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Error Icon P0500

Vehicle Speed Sensor Malfunction

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Severity Icon 4/10

Error Icon P0030

Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1

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Error Icon P0032

Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1

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Error Icon P0136

O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

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Error Icon P0483

Cooling Fan Rationality Check Malfunction

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Severity Icon 3/10

Error Icon P0442

Evaporative Emission Control System Leak Detected

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Severity Icon 8/10

Error Icon P0301

Cylinder 1 Misfire Detected

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Severity Icon 4/10

Error Icon P0031

Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1

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Severity Icon 3/10

Error Icon P0456

Evaporative Emissions System Small Leak Detected

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Severity Icon 4/10

Error Icon P0137

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

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Severity Icon 9/10

Error Icon P0300

Random/Multiple Cylinder Misfire Detected

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Severity Icon 5/10

Error Icon P0172

System Too Rich (Bank 1)

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Error Icon P0328

Knock Sensor 1 Circuit High Input (Bank 2 or Single Sensor)

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Error Icon P0506

Idle Control System RPM lower Than Expected

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Error Icon P0560

System Voltage Malfunction

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Severity Icon 4/10

Error Icon P0102

Mass or Volume Air Flow Circuit Low Voltage Input

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Severity Icon 8/10

Error Icon P0340

Camshaft Position Sensor Circuit Malfunction

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Severity Icon 4/10

Error Icon P0455

System Gross Leak Evaporative Emission

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Error Icon P0336

Crankshaft Position Sensor A Circuit Range/Performance

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Error Icon P0457

Evaporative Emission Control System Leak Detected

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Error Icon P1443

Evaporative Emission System Control Valve Low/No Flow

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Error Icon P1380

Misfire Detected - Rough Road Data Not Available

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Error Icon P1469

Low A/C Cycling Period

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Error Icon P1604

Code Word Unregestered

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Error Icon P1410

Intake air flap control actuator – circuit malfunction

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Error Icon P1491

Exhaust Gas Recirculation Valve Insufficient Lift

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Error Icon P1507

Idle Air Control Underspeed Error

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Error Icon P1718

TFT Sensor In Range Failure High

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Severity Icon 9/10

Error Icon P0011

Intake Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 9/10

Error Icon P2138

Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

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Error Icon P2004

Intake Manifold Runner Control (IMRC )

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Error Icon P1133

HO2S Insufficient Switching Sensor 1

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Severity Icon 8/10

Error Icon P1235

Fuel Pump Control Out Of Range

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Error Icon B1608

Illuminated Entry Input Open Circuit

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Severity Icon 8/10

Error Icon P0303

Cylinder 3 Misfire Detected

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Error Icon P1449

Evaporative Check Solenoid Circuit Malfunction

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Severity Icon 7/10

Error Icon P2096

Post Catalyst Fuel Trim System Too Lean Bank 1

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Error Icon P0018

Crankshaft Position Camshaft Position Correlation Bank 2 Sensor A

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Error Icon U0140

Lost Communication With Body Control Module

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Severity Icon 9/10

Error Icon U0073

Control Module Communication Bus "A" Off

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Error Icon U1221

SCP (J1850) Invalid or Missing Data for Interior Lamp Outage

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Error Icon U1201

SCP (J1850) Invalid or Missing Data for Seat Motion / Control

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Error Icon P1153

HO2S Insufficient Switching Bank 2 Sensor 1

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Error Icon P1710

Transmission control valve solenoids -ground circuit malfunction

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Error Icon P1603

EEPROM Malfunction

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Severity Icon 7/10

Error Icon P0010

Intake Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 9/10

Error Icon P0012

Intake Camshaft Position Timing - Over-Retarded (Bank 1)

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Severity Icon 7/10

Error Icon P0013

Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

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Severity Icon 8/10

Error Icon P0014

Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)

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Severity Icon 8/10

Error Icon P0016

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

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Severity Icon 8/10

Error Icon P0017

Crankshaft Position Camshaft Position Correlation Bank 1 Sensor B

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Severity Icon 4/10

Error Icon P0036

Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2

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Severity Icon 8/10

Error Icon P0106

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

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Severity Icon 4/10

Error Icon P0128

Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

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Severity Icon 6/10

Error Icon P0131

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

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Severity Icon 7/10

Error Icon P0134

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

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Severity Icon 6/10

Error Icon P0135

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

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Severity Icon 6/10

Error Icon P0138

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

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Severity Icon 6/10

Error Icon P0141

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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Severity Icon 5/10

Error Icon P0175

System Too Rich (Bank 2)

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Severity Icon 8/10

Error Icon P0304

Cylinder 4 Misfire Detected

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Severity Icon 8/10

Error Icon P0305

Cylinder 5 Misfire Detected

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Severity Icon 8/10

Error Icon P0306

Cylinder 6 Misfire Detected

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Severity Icon 3/10

Error Icon P0325

Knock Sensor 1 Circuit (Bank 2 or Single Sensor)

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Severity Icon 8/10

Error Icon P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

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Severity Icon 8/10

Error Icon P0335

Crankshaft Position Sensor A Circuit Malfunction

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Severity Icon 6/10

Error Icon P0341

Camshaft Position Sensor Circuit Range/Performance

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Severity Icon 7/10

Error Icon P0401

Exhaust Gas Recirculation Flow Insufficient Detected

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Subaru Forester Image

About the Forester

The Forester first made its debut back in 1997. Since then, a total of five generations have been unveiled. The latest of these hit the markets in 2018.

The model, like a number of Subaru offerings, has seen intermittent praise over the years. Some of the most notable of its accolades include the 2009 and 2014 Motor Trend SUV of the Year.

The compact crossover SUV has faced a number of competitors over the years, mainly from other Japanese manufacturers. The most notable of these include the Honda CR-V, Mazda CX-30, and Volkswagen Tiguan.

The most common issue that the model has faced over the years is fault code P0420. This code indicates that there is a problem with the catalytic converter.

There are a number of things that should be done when addressing this issue. The oxygen sensors near the catalytic converter should be checked for any issues and the exhaust should also be checked for leaks, particularly upstream of the converter. In some cases, the converter needs to be replaced.

Another common code is P0700, which relates to the transmission control system. This is a ambiguous code that typically needs a higher-quality code scanner to pick up the cause of the issue.

This code may commonly pop up after changing automatic transmission fluid, which can be a clear indicator that there is a problem with the fluid.

Fault code P0028 is another code that the Forester has faced fairly often. This code is logged when a problem has been detected with the intake valve control solenoid for the second bank of the engine.

One of the most common causes that owners have reported is dirty or old engine oil. The addition of engine cleaners has proved to be fairly successful in many cases.