Check Engine Light code retrieval
So you were driving your car and suddenly the 
starts to glow.
What is this? What to do? Well i'm here to help.
The CEL (Check Engine Light) turns on to inform you that something with the
transmission or engine is not functioning properly.
To check the code on the Accord and most OBDI and OBDII Hondas just follow these simple steps.
*Note* It has come to my attention that some 96 Accords have a service connector behind the ashtray.
1. Open passenger door.
2. Look underneath glove compartment area.
3. Look for a plastic piece that has plugs in it.
Note: The blue plastic has either one (OBDII) or two (OBDI) plugs I BELIEVE.
From what I know, OBDI has the TCM(trans) and ECM(engine) separate.
OBDII has them combined.
4. Grab the plug with TWO wires, which is the ECM plug.
5. Stick something metal into the plug connect the two wires.
I used a quick disconnect used in electronics.
6. Turn the key in the ignition to the II position.
7. The CEL should start blinking, this is the code.
The code is done with long and short blinks.
A long blink adds ten, while a short blink adds one.
Three long + five short = 35, easy.
Note: In my experiences, if it is a transmission problem on an automatic
transmission,
the D4 on the dash will blink.
Codes for Hondas and Acuras OBDI and newer.
1 Oxygen Sensor "A" (Primary) 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
* not 94-95
6 ECT Sensor (Engine Coolant Temperature) defective circuit or unplugged / defective sensor
7 TP Sensor (Throttle Position) defective circuit or unplugged / defective sensor
8 TDC Sensor (Top Dead Center) defective circuit or unplugged / defective sensor
9 CYP Sensor (Cylinder) defective circuit or unplugged / defective sensor
* invalid code for throttle body injection Hondas
** invalid code for V6 engines
10 IAT Sensor (Intake Air Temperature) defective circuit or unplugged / defective sensor
12 EGR Lift Sensor (Exhaust Gas Recirculation) defective circuit or unplugged / defective sensor
* invalid code for non-equipped EGR valve vehicles
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
* invalid code for non-VTEC engine
** invalid for V6 engine
22 VTEC Oil Pressure Switch defective circuit or unplugged / defective oil pressure switch
* invalid code for non-VTEC engine
23 KS (Knock Sensor) defective circuit or unplugged / defective sensor
* invalid code for V6 engine
30 Automatic Transmission Signal: "A" / SEAF / SEFA / TMA or TMB defective circuit or unplugged / defective sensor
* invalid code for 1996
41 Primary Oxygen Sensor - Heater circuit malfunction
43 Fuel Supply System defective or malfunctioning fuel supply system
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
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
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
Oh, and before you go, this indicator, when it changes from green
just tells you that you have driven 6k miles since it was last reset.
Basically it is a wake-up call for you to make sure everything is OK.
Just stick your key in the hole near it to reset.