Honda Accord OBD I/II Codes

What is OBD?

On-Board Diagnostics (OBD) is an interface to retrieve error codes from you car's Engine Control Unit (ECU).
Because of OBD, we can generalize failures to specific codes, and make pinpointing problems easier. Even though this may be true, there are circumstances where and OBDcode may not point to the obvious, and could require more research.

For more information about On-Board Diagnostics, see [OBD on Wiki]

OBD-I Codes

Code Short Long
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 Centre Sensor
9 CYP Cylinder Sensor
10 IAT Intake Air Temperature Sensor
12 EGR Exhaust Gas Recirculation Lift Valve
13 BARO Atmospheric Pressure Sensor
14 IAC (EACV) Idle Air Control Valve
15 Ignition Output Signal
16 Fuel Injectors
17 VSS Speed Sensor
19 Automatic Transmission Lockup Control Valve
20 Electrical Load Detector
21 Vtec Spool Solenoid Valve
22 Vtec Pressure Valve
23 Knock Sensor
30 Automatic Transmission A Signal
31 Automatic Transmission B Signal
36 Traction Control Found On Jdm Ecu's
41 Primary Oxygen Sensor Heater
43 Fuel Supply System
45 Fuel System Too Rich Or Lean
48 LAF Lean Air Fuel Sensor
54 CKF Crank Fluctuation Sensor
58 TDC Tdc Sensor #2
61 Primary Oxygen Sensor
63 Secondary Oxygen Sensor
65 Secondary Oxygen Sensor Heater
71 Random Misfire Cylinder 1
72 Random Misfire Cylinder 2
73 Random Misfire Cylinder 3
74 Random Misfire Cylinder 4


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