We have temporarily put all tuning system/ECU sales on hold while we implement policies to comply with new EPA rules and enforcement actions. Restricted sales on ECU's and tuning systems will resume soon with the new procedures to be sure we comply with regulations.

Check Engine Light Codes / Diagnostic Trouble Codes

All Obd 0, Obd 1, and Obd2 Honda and Acura vehicles will give a "check engine light" when a diagnostic error occurs. The following is a complete list of codes to help you diagnose your check engine light.

OBD 0/1/2 CEL CODES:

0 - ECU - Faulty ECU or ECU ROM Diagnostic Proceedure
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 Proceedure
11 - engine overheating
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 - vehicle speed sensor
19 - Automatic transmission lockup control valve
20 - ELD - 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 some JDM ecu's
38 - Secondary VTEC solenoid on JDM 3 stage D15B Vtec ECUs (P2J)
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 sensor #2
61 - Primary oxygen sensor
63 - Secondary oxygen sensor circuit
65 - Secondary oxygen sensor heater wire (black wires)
67 - Catalytic Converter
71 - random misfire cylinder 1
72 - random misfire cylinder 2
73 - random misfire cylinder 3
74 - random misfire cylinder 4
80 - EGR Valve/Line
86 - ECT sensor - Cooling System
91 - Fuel Tank pressure sensor
92 - EVAP Solenoid/Valve/Vacuum Lines


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
8 - Shift Solenoid 'B' circuit open or shorted
9 - Counter shaft or transmission speed pulse generator open or shorted
10 - Coolant Temperature Sensor open or shorted
11 - Engine RPM (Ignition coil signal) open or shorted
12 - (No code 12 used)
13 - Main shaft speed pulse generator open or shorted
14 - Linear (line pressure control) solenoid open or shorted
15 - Kick down switch circuit shorted

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