All California vehicles are equipped with a "Check Engine" light located on the instrument panel. The light will illuminate when the ignition switch is turned to the "ON" position (bulb check) and when systems related to the emission controls are malfunctioning during normal operation (Mode 1) with the engine running.

NOTE: Under normal operation, the vehicle operates in Mode 1 of self diagnostics. If an emission control problem is detected the "Check Engine" light will illuminate. Then the ECU automatically enters Mode 2 and the "Check Engine" light will flash simultaneously with the Red LED inspection light on the ECU. The trouble codes for each malfunction can be identified by entering Mode 3 and obtaining the identification trouble code for that fault.

Depending on the vehicles control system, some or all of the following components are monitored by the "Check Engine" light function: Code 12-Mass Airflow Meter, Code 14-Vehicle Speed Sensor, Code 23-Idle Switch Circuit, Code 24-Full Throttle Switch Circuit, Code 31-Engine Control Unit (ECU), Code 32-EGR Function, Code 33 Exhaust Gas Sensor Circuit and Code 45-Injector Leakage.

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

California Models Only

Use the Manual With the Right Hardware

When to See a Mechanic

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