WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily or stops fuel injection.

DTC	Component	Fail-Safe Operation	Fail-Safe Deactivation Condition
P0031 P0032	Air fuel ratio sensor heater	ECM turns off air fuel ratio sensor heater	Ignition switch off
P0037 P0038	Heated oxygen sensor heater	ECM turns off heated oxygen sensor heater	Ignition switch off
P0102 P0103	Mass air flow meter	ECM calculates ignition timing according to engine speed and throttle valve position	Pass condition detected
P0112 P0113	Intake air temperature sensor	ECM estimates intake air temperature to be 20°C (68°F)	Pass condition detected
P0115 P0117 P0118	Engine coolant temperature sensor	ECM estimates engine coolant temperature to be 80°C (176°F)	Pass condition detected
P0120 P0121 P0122 P0123 P0220 P0222 P0223 P0601 P0604 P0606 P060A P060D P060E P0657 P1607 P2102 P2103 P2111 P2112 P2118 P2119 P2135	Electronic throttle control system	ECM cuts off throttle actuator current and throttle valve returns to the 5.5° throttle position by return spring ECM then adjusts engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with accelerator pedal opening angle, to allow vehicle to continue at minimal speed *1	Pass condition detected and then ignition switch turned off
P0300 P0301 P0302 P0303 P0304 *2	Fuel injector Electronic throttle control system	When a catalyst damaging misfire occurs (MIL blinking), following fail-safe operation performed for catalyst overheat malfunction prevention Under low load and low engine speed Fuel cut performed on malfunctioning cylinder Under high load and high engine speed Throttle valve opening angle control is performed All cylinder fuel cut or malfunctioning cylinder fuel cut performed	Pass condition detected and then ignition switch turned off
P0327 P0328	Knock Sensor	ECM sets ignition timing to maximum retard	Ignition switch off
P0351 to P0354	Igniter	ECM cuts fuel	Pass condition detected
P2120 P2121 P2122 P2123 P2125 P2127 P2128 P2138	Accelerator pedal position sensor	Accelerator pedal position sensor has 2 sensor circuits: Main and Sub. If either circuit malfunctions, the ECM controls the engine suing the other circuit. If both circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.	Pass condition detected and then ignition switch turned off

HINT:

*1: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.
*2: Misfire related fail-safe operations occur when catalyst overheat malfunctions occur.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fail-Safe Chart

Use the Manual With the Right Hardware

When to See a Mechanic