Toyota car fault codes and warning indicators, with meanings, causes, and step-by-step fixes.
30 models · 5 error codes
On a Toyota Camry, P0171 means the engine computer has found the Bank 1 air-fuel mixture running too lean — more air than the fuel system can compensate for — after fuel trims maxed out trying to correct it.
On Toyota vehicles, P1135 means a fault in the air/fuel-ratio (A/F) sensor heater circuit for bank 1, sensor 1 — the wideband sensor Toyota uses upstream.
On Toyota vehicles, P1155 means a fault in the air/fuel-ratio (A/F) sensor heater circuit for bank 2, sensor 1 — the same fault as P1135 on the other bank.
On Toyota vehicles, P1300 means a fault in the igniter/ignition coil circuit on bank 1 — the ECM isn't seeing a correct ignition confirmation signal.
On Toyota vehicles, P1349 means a fault in the variable valve timing (VVT/VVT-i) system on bank 1 — the cam timing isn't responding as commanded.
These codes apply across Toyota models, including:
