Toyota 4Runner — OBD2 codes & common problems
Look up any check-engine / OBD2 code for the Toyota 4Runner and get a diagnosis tuned to its known failure patterns, TSBs, and NHTSA recalls. Pick your model year on any code page below.
Mid-size SUV 16 NHTSA recalls on record 170 owner complaints
See the full Toyota 4Runner recalls & common problems breakdown — most-reported systems and recalls by model year.
About the Toyota 4Runner
The Toyota 4Runner (2010-2014, 2015-2019, 2020-2024) was commonly sold with 4.0L V6. Common trims include SR5, TRD Off-Road, TRD Pro, Limited. The diagnostic guides below account for these powertrains where the failure pattern differs.
Diagnostic codes for the Toyota 4Runner
- 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)
- P0016 — Crank/Cam Correlation Fault (Bank 1 Intake)
- P0017 — Crank/Cam Correlation (Bank 1 Exhaust)
- 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)
- P0138 — Post-Cat O2 Sensor High Voltage (Bank 1 Downstream)
- P0141 — Post-Cat O2 Heater Circuit (Bank 1 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
- 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)
- P0442 — EVAP Small Leak Detected
- 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
- P0741 — Torque Converter Clutch Stuck Off
- P0750 — Shift Solenoid A Malfunction
- 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 straight to the generation that matches your 4Runner: