If you drive a Honda or Acura vehicle equipped with OBD 0, OBD 1, or OBD 2 systems, a check engine light (CEL) will illuminate when a diagnostic error occurs. To help you understand and address these issues, we've compiled a comprehensive list of CEL codes and their meanings.
OBD 0/1/2 CEL Codes
- 0 - ECU: Faulty ECU or ECU ROM Diagnostic Procedure
- 1 - O2A: Oxygen sensor #1
- 2 - O2B: Oxygen sensor #2
- 3 - MAP: Manifold absolute pressure sensor
- 4 - CKP: Crank position sensor
- 5 - MAP: Manifold absolute pressure sensor
- 6 - ECT: Water temperature sensor
- 7 - TPS: Throttle position sensor
- 8 - TDC: Top dead center sensor
- 9 - CYP: Cylinder sensor
- 10 - IAT: Intake air temperature sensor Diagnostic Procedure
- 11 - Engine overheating
OBD1 TCU Codes
- 1 - Lock-up solenoid 'A' circuit: Open or shorted
- 2 - Lock-up solenoid 'B' circuit: Open or shorted
- 3 - Throttle Position Sensor circuit: Open or shorted
- 4 - Vehicle Speed Sensor: Open or shorted - No signal from speedometer
- 5 - Shift Lever Position Switch circuit: Shorted
- 6 - Shift Lever Position Switch circuit: Open
- 7 - Shift Solenoid 'A' circuit: Open or shorted
Understanding these codes can help you diagnose and address issues in your Honda or Acura vehicle efficiently. Always refer to your vehicle’s manual or consult with a professional mechanic for accurate diagnosis and repair.
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