1998 GMC Yukon Q&A
1998 GMC Yukon Question: check engine light on
Can you list the codes that you are getting? - Bret Bodas
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
why check engine light on
One or more fuel injectors may become stuck closed causing an engine misfire and the Chec...
One or both secondary air injection check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves...
I have a 2007 yukon with a check engin light on and have tried all of the basics. replaced the evap vent solinoid, the evap canister, the gas cap, and check the voltage going to the evap solinoid. ...