ok so sometimes the CEL will go on for code 1 (o2 sensor) and sometimes it wont. sometimes when i first start the car, itll stay on for about a minute and then go away while im driving and sometimes itll just come on while im driving. basically it comes on an off sometimes while the car is still on and i never take the key out of the ignition. any idea what it could be?

its an obd1 p72 with hondata s200b. im also using an obd2a to obd1 conversion harness.

 

O2 is going out. Replace it and should be fine.

 

oh ok thanks, but is it normal for a cel to go on and off while the car is on? i thought once the cel goes on it will stay on untill i turn the car off.

 

usually yes, However the O2 sensor is one of those that can trip it then go away.

 

oh wow, i never knew that. thanks