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Hello and welcome! My name is ***** ***** I can assist you with your question. YES, I agree. The problem should be diagnosed before any parts are replaced.
Every time the key is turned to the on position, the check engine light should come on with the key on for 2 seconds and then it should go out. If this does not happen, there is an electrical issue that needs to be diagnosed.
Your saying that the check engine light stays on from anywhere between 5 to 23 minutes after turning the key on? Is that correct?