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I just bought a 2001 Honda civic ex and the previous owner said it didn't have a check engine light on so I take it for emissions and the light was on. They said it was both o2 sensors and a coolant sensor. I bought then and replaced them yesterday. I heard that I was supposed to run the car until the computer is calibrated. I ran it for 30 miles and took it to autozone. The o2 sensors that I just replaced came back as a potential problem. I'm not not sure if I should keep running my car or if I should buy a new catalytic converter? Help anyone?

 
Rep Power: 174

It takes up to 100 miles for the ECU to completely relearn everything. You should do an "idle relearn" just to be certain. Check the bottom of the first post here:
https://www.civicforums.com/forums/1...e-up-mods.html

 
Rep Power: 518

What were the code numbers?
Bought what/what brands?
Do you still have the old parts?
You do this to "run the monitors", or on-board diagnostic system self test routines.

You can sit in the car, turn the key on (do not start the engine) and after about 20 seconds the check engine light will flash a few times if the monitors have not completed. (more driving needed)
Once you can do this and NOT have the light flash, that means the monitors finally completed ---and if the CEL is still off while driving you can go take the test.

What are the code numbers?
Ha.

 
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What is an "idle return?" Just leaving the car on without driving it?

 
Rep Power: 518

That would be a reading fail LOL


Click the link you were given. The how-to is near the bottom of the first post.

 
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It was the spell check on my phone lol