DIAGNOSTIC CODE IDENTIFICATION ⁽¹⁾

Code ⁽²⁾

CHECK ENGINE Light

System Affected

RPM

Ignition

⁽³⁾ QCT Control

Main Oxygen Sensor or Sensor Heater

Water Temperature Sensor

⁽⁴⁾ On

Intake Air Temperature Sensor

Air/Fuel Ratio Lean Malfunction

Air/Fuel Ratio Rich Malfunction

⁽⁴⁾ On

Sub-Oxygen Sensor

Airflow Meter

⁽⁴⁾ On

Throttle Position Sensor

Off

Vehicle Speed Sensor

⁽⁵⁾ Off

Starter

Off

Switch Condition

Knock Sensor

Knock Control

⁽⁴⁾ On

EGR System Malfunction

⁽¹⁾	If diagnostic code displayed is not shown in this table, ECU is faulty.

⁽²⁾	All diagnostic codes except Codes 16, 51 and 53 will remain in ECU memory until erased.

⁽³⁾	Electronically Controlled Transaxle (ECT).

⁽⁴⁾	California vehicles only.

⁽⁵⁾	Code 43 sets if vehicle is push-started.

NOTE: Electronically Controlled Transmission (ECT) uses same ECU as EFI system.

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

Trouble Code Definition