Warren,

If you are unhappy with the performance of your 300SE, you may be running in open loop. Cosidering where you live I am assuming you have a Federal car which means that your check engine light will only come on if there is a failure in the o2 system. You will need to plug an off ratio meter into the round diagnostic plug at terminal #3 to see if it sweeps. if you get a fixed reading, you need to look that reading up in the DTC code book to determine where the problem is. Your system can't be scanned, because it is analog, and there is no data stream.

Peter

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