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Honda Diagnostic Codes, Trouble Codes and Descriptions. Basic Codes.

WesTech Auto

Diagnostic Codes

Honda

Basic Codes
Check Engine Light or ECM LED
0 Engine Control Module.
1 Heated Oxygen Sensor or Oxygen Sensor.
2 Heated Oxygen Sensor or Oxygen Sensor (Fuel Injection) or Vehicle Speed Sensor (Carburetor).
3 Manifold Absolute Pressure (MAP) Sensor.
4 Crankshaft Position (CKP) Sensor (Fuel Injection) or Vacuum Switch (Carburetor).
5 MAP Sensor.
6 Engine Coolant Temperature (ECT) Sensor.
7 Throttle Position Sensor (Fuel Injection), Manual Transmission Clutch Switch Signal (Carburetor), or Automatic Transmission Shift Position Signal (Carburetor).
8 Crankshaft Position (CKP) or Top Dead Center (TDC) Sensor problem (Fuel Injection) or Ignition Coil Signal (Carburetor).
9 No. 1 Cylinder Position Sensor.
10 Intake Air Temperature (IAT) Sensor.
12 EGR System.
13 Barometric Pressure (BARO) Sensor.
14 Idle Air Control (IAC) Valve.
15 Ignition Output Signal.
16 Fuel Injector System.
17 Vehicle Speed Sensor.
19 Lock-Up Solenoid Valve.
20 Electric Load Detector.
21 VTEC Solenoid Valve.
22 VTEC Pressure Switch.
23 Knock Sensor.
30 Automatic Transmission FI Signal A.
31 Automatic Transmission FI Signal B.
41 Heated Oxygen Sensor Heater.
43 Fuel Supply System.
48 Heated Oxygen Sensor.
The Diagnostic Codes and Explanations are derived from Manufacturer supplied Technical Data. WesTech does not guarantee the accuracy of this Information nor can it be held liable for providing it.
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