I have a 93 Civic with a 99 GSR motor with an OBD1 Ecu turbocharged. I have a feeling my 02 sensor might be bad. I am getting a CEL but it doesnt come on untill the car has warmed up. Thats why I think it may have to do with the o2 sensor, does anyone have any ideas can anyone confirm this??

 

how about checking the code? that might be a good start.

 

i have the same problem on my 90 civic si stock. The check engine lite will only come on after the car is warm
example( comes on about 5 miles after i first start it in the morning. After the light comes on i shut off the car and turn it back on it will take about 30 seconds for the light to come back on, because the car is still warm.

how do i check for codes on OND-0 cars?

 

How do I do that on my ECU? I have done it with the blinking light on the old ECU but not on mine. Let me know

 

the both get jumped the same way, but obd-0 would have the LED on the ecu and obd1&2 blinks at the CEL

 

thank you sir