Honda and Acura Check Engine Light Codes – Diagnostic Trouble Codes

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 – 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
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