Way to check codes on your 92-95 civic.
If you go to passanger side kick panel and raise up the carpet u sould see your ecu. and above your ECU there will be a lil plug. iIts grey. with 2 wires coming out of it. One wire is black with a white stripe and the other is a red with a black strip.. I take a spare piece of thin speaker wire and cut off both ends so that the actual copper of the wire is showion on both ends. i twist up both ends so that they are in a nice point. stick one end of the wire into the fist socket on the plug. The other end of the wire into the other socket. Turn your key to the ON position.. dont start your car. just to the ON position. Watch your check engine light on your cluster. it will flash.. 1 long flash is 10. the quick flashes are one. so if ur CEL goes !.....!!! that is a code 13. !....!....!!!!! code 25. then take the code #'s and hop on this thread and see what it is. i hope i could help you all.
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92-95 civic:
0 - Faulty ECM/PCM
1 - Oxygen content
3 - Manifold absolute pressure
4 - Crank angle sensor
5 - Manifold absolute pressure
6 - Coolant temperature
7 - Throttle angle
8 - TDC position
9 - Number 1 cylinder position
10 - Intake air temperature
12 - Exhaust gas recirculation system
13 - Barometric pressure
14 - Idle air control
15 - Ignition input signal
16 - Fuel injector
17 - Vehicle speed sensor
19 - Lock-up control
20 - Electronic load detector
21 - VTEC solonoid
22 - VTEC control pressure switch
30 - Automatic transmission signal
41 - Oxygen sensor heater
43 - Fuel supply system
48 - Oxygen sensor heater

OBD-II Error Codes
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This is for 96-00 civics:

How do I reset my ECU? How do I read codes from my ECU?

- To reset your ECU, simply pop your hood, disconnect your battery terminals for a short period of time (recommendations range from 30 seconds to 5 minutes), then replace the terminals.

To read the trouble codes on your ECU, uncover your ECU (should be located by lifing the carpeting on the passenger's side. the ecu may be on the right, or in the center below the carpeting), and count the red flashes.

1 - Primary oxygen sensor low/high output
3 - Manifold absolute pressure sensor low/high input
4 - Crankshaft position sensor
5 - Manifold absolute pressure circuit range/performance problem
6 - Engine coolant temperature sensor low/high input
7 - Throttle position sensor low/high input
8 - Crankshaft position/TDC position error or no signal
9 - Cylinder position sensor error or no signal
10 - Intake air temperature sensor low/high input
12 - EGR valve insufficient lift or sensor high voltage
13 - BARO sensor low/high input or error
14 - IAC valve system fault
17 - Vehicle speed sensor circuit
20 - Electrical load detector circuit low/high input
22 - VTEC system malfunction
23 - Knock sensor circuit fault
30 - TMA/TMB signal line open or short
41 - Primary oxygen sensor heater circuit fault
45 - System too lean/rich
48 - Primary heated oxygen sensor malfunction
61 - Primary oxygen sensor circuit slow response / range prob
63 - Secondary heated O2 sensor low/high output
65 - Secondary heated O2 sensor circuit fault
67 - Catalyst system efficiency below threshold
70 - Automatic transaxle
71 - Cylinder 1 misfire
72 - Cylinder 2 misfire
73 - Cylinder 3 misfire
74 - Cylinder 4 misfire
80 - EGR insufficient flow detected
86 - Engine coolant temperature sensor circuit range/perf prob
90 - EVAP system leak detected in fuel tank or canister area
91 - EVAP fuel tank pressure sensor low/high input
92 - EVAP system insufficient purge flow