1: Oxygen Sensor "A" (Primary)
defective circuit or unplugged / defective sensor
2: Oxygen Sensor "B"
defective circuit or unplugged / defective sensor
3: MAP Sensor (Manifold Absolute Pressure)
defective circuit or unplugged / defective sensor
4: CKP Sensor (Crankshaft Position Sensor)
defective circuit or unplugged / defective sensor
5: MAP Sensor (Manifold Absolute Pressure)
mechanical problem / disconnected piping
6: ECT Sensor (Engine Coolant Temperature)
defective circuit or unplugged / defective sensor
7: TPS (Throttle Position Sensor)
defective circuit or unplugged / defective sensor
8: TDC Sensor (Top Dead Center)
defective circuit or unplugged / defective sensor
9: CYP Sensor (Cylinder #1 Position)
defective circuit or unplugged / defective sensor
10: IAT Sensor (Intake Air Temperature)
defective circuit or unplugged / defective sensor
12: EGR Lift Sensor (Exhaust Gas Recirculation)
check the hoses, the EGR valve lift sensor and the System EGR valve.
13: BARO Sensor (Atmospheric Pressure)
defective circuit or unplugged / defective sensor
14: IAC Valve (Idle Air Control)
defective circuit or unplugged / defective sensor
15: Ignition Output Signal
missing or defective ignition output signal
16: Fuel Injector System
defective circuit or unplugged / defective fuel injector
17: VSS (Vehicle Speed Sensor)
defective circuit or unplugged / defective sensor
19: Automatic Transmission Lock Up Control Solenoid Valve
defective circuit or unplugged / defective solenoid valve
20: Electrical Load Detector
defective circuit or unplugged / defective sensor
21: VTEC Solenoid Valve
defective circuit or unplugged / defective solenoid valve
22: VTEC Oil Pressure Switch
defective circuit or unplugged / defective oil pressure switch
23: KS (Knock Sensor)
defective circuit or unplugged / defective sensor
30: Automatic Transmission Signal: "A" / SEAF / SEFA / TMA or TMB
defective circuit or unplugged / defective sensor
31: Automatic Transmission Signal "B"
defective circuit or unplugged / defective sensor
41: Primary Oxygen Sensor - Heater
check the heater for the proper voltage signal.
43: Fuel Supply System
check the fuel pressure, fuel pressure regulator. check the oxygen sensor. also, check for vacuum leaks.
45: System Too Lean or Too Rich
malfunction in the fuel monitoring systems

48: LAF Sensor (Lean Air Fuel)
defective circuit or unplugged / defective sensor
54: CKF Sensor (Crankshaft Speed Fluctuation)
defective circuit or unplugged / defective sensor
58: TDC Sensor 2 (Top Dead Center)
defective circuit or unplugged / defective sensor
61: Oxygen Sensor, Heated - Sensor 1 (Primary)
high voltage, low voltage, or slow response
63: Oxygen Sensor, Heated - Sensor 2 (Secondary)
high voltage, low voltage, or slow response
65: Oxygen Sensor Heater (Secondary)
malfunctioning or defective oxygen sensor heater
67: Catalyst system Efficiency Below Threshold
malfunctioning or defective catalyst system
70: Automatic Transmission
malfunction with the automatic transmission controls
71: Cylinder 1 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
72: Cylinder 2 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
73: Cylinder 3 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
74: Cylinder 4 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
75: Cylinder 5 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
76: Cylinder 6 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire
80: Exhaust Gas Recirculation
insufficient flow detected
86: ECT Sensor (Engine Coolant Temperature)
circuit range / performance problem
90: Evaporative Emission Control System
leak detected in the fuel tank area
91: Fuel Tank Pressure Sensor
low input
92: Evaporative Emission Control System
insufficient purge flow