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Subaru Forester — OBD2 codes & common problems

Look up any check-engine / OBD2 code for the Subaru Forester and get a diagnosis tuned to its known failure patterns, TSBs, and NHTSA recalls. Pick your model year on any code page below.

See the full Subaru Forester recalls & common problems breakdown — most-reported systems and recalls by model year.

Diagnostic codes for the Subaru Forester

• P0011 — Intake Cam Over-Advanced (Bank 1, VVT)
• P0012 — Intake Cam Over-Retarded (Bank 1, VVT)
• P0013 — Exhaust Cam Actuator Circuit Fault (Bank 1)
• P0014 — Exhaust Cam Over-Advanced (Bank 1, VVT)
• P0015 — Exhaust Cam Over-Retarded (Bank 1, VVT)
• P0016 — Crank/Cam Correlation Fault (Bank 1 Intake)
• P0017 — Crank/Cam Correlation (Bank 1 Exhaust)
• P0019 — Crank/Cam Correlation (Bank 2 Exhaust)
• P0024 — Exhaust Cam Over-Advanced (Bank 2, VVT)
• P0101 — MAF Sensor Range / Performance
• P0102 — MAF Sensor Low Input
• P0113 — Intake Air Temperature High Input
• P0118 — Coolant Temp Sensor High Input
• P0121 — Throttle Position Sensor Range / Performance
• P0125 — Coolant Too Cold for Closed-Loop Fuel Control
• P0128 — Engine Not Reaching Operating Temperature
• P0131 — O2 Sensor Low Voltage (Bank 1 Upstream)
• P0133 — O2 Sensor Slow Response (Bank 1 Upstream)
• P0135 — O2 Sensor Heater Circuit (Bank 1 Upstream)
• P0136 — Post-Cat O2 Sensor Circuit Fault (Bank 1)
• P0137 — Post-Cat O2 Sensor Low Voltage (Bank 1 Downstream)
• P0138 — Post-Cat O2 Sensor High Voltage (Bank 1 Downstream)
• P0140 — Post-Cat O2 Sensor No Activity (Bank 1 Downstream)
• P0141 — Post-Cat O2 Heater Circuit (Bank 1 Downstream)
• P0156 — Post-Cat O2 Sensor Circuit Fault (Bank 2)
• P0157 — Post-Cat O2 Sensor Low Voltage (Bank 2 Downstream)
• P0171 — Fuel System Too Lean (Bank 1)
• P0172 — Fuel System Too Rich (Bank 1)
• P0174 — Fuel System Too Lean (Bank 2)
• P0300 — Random or Multiple Cylinder Misfire
• P0301 — Cylinder 1 Misfire
• P0325 — Knock Sensor 1 Circuit Fault
• P0335 — Crankshaft Position Sensor Circuit Fault
• P0340 — Camshaft Position Sensor Circuit Fault
• P0341 — Camshaft Position Sensor Range / Performance
• P0342 — Cam Position Sensor Low Input (Bank 1)
• P0343 — Cam Position Sensor High Input (Bank 1)
• P0345 — Camshaft Position Sensor Circuit (Bank 2)
• P0401 — EGR Flow Insufficient
• P0411 — Secondary Air Injection Insufficient Flow
• P0420 — Catalyst Efficiency Below Threshold
• P0430 — Catalyst Efficiency Below Threshold (Bank 2)
• P0440 — EVAP System Malfunction (Generic)
• P0441 — EVAP Incorrect Purge Flow
• P0442 — EVAP Small Leak Detected
• P0443 — EVAP Purge Valve Circuit Fault
• P0446 — EVAP Vent Control Circuit Fault
• P0455 — EVAP Large or Gross Leak Detected
• P0456 — EVAP Very Small Leak Detected
• P0496 — EVAP High Purge Flow / Stuck-Open Purge Valve
• P0497 — EVAP Low Purge Flow
• P0500 — Vehicle Speed Sensor Malfunction
• P0507 — Idle Higher Than Expected
• P0521 — Oil Pressure Sensor Range / Performance
• P0606 — PCM Internal Processor Fault
• P0700 — Transmission Control System Malfunction
• P0720 — Transmission Output Speed Sensor Malfunction
• P0740 — Torque Converter Clutch Circuit Fault
• P0741 — Torque Converter Clutch Stuck Off
• P0743 — Torque Converter Clutch Circuit Electrical Fault
• P0750 — Shift Solenoid A Malfunction
• P0846 — Trans Fluid Pressure Sensor B Range / Performance
• P2096 — Post-Cat Trim Lean (Bank 1)
• P2187 — System Too Lean at Idle (Bank 1)
• P2270 — Post-Cat O2 Stuck Lean (Bank 1 Downstream)

Diagnose by model year

Jump to popular codes for the model year that matches your Forester:

• 2012 Subaru Forester: P0420, P0300, P0171, P0455, P0700
• 2017 Subaru Forester: P0420, P0300, P0171, P0455, P0700
• 2022 Subaru Forester: P0420, P0300, P0171, P0455, P0700