Just wondering if not having the climate control part of the dash harness plugged into the raido bezel area will cause a cel to come on. I just replaced my 96 to 98 heater core and blower motor with a 99 00 unit. I just dont have the radio bezel yet to finish the conversion. Thanks for your time.

 

no CEL will only come on if emision related parts fail run the code and you will have a better understaind on what the problem is

 

Thanks for the answer. It was my secondary o2 sensor.