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Yikes!!! Sounds like this guy is guessing his ass of to find the problem. If the CEL was not on, I don't know why he would replace the cam sensor. My LE has over 185,000 on it and the fuel pump and starter are original. Alternator has been replaced once. Your mechanic scares me. Sounds like he's throwing parts at your problem. Did he show you the spark plugs by any chance? If so how did they look? I find it unusual that the cat and o2 sensor are getting that hot. That symptom usually results from burnt exhaust valves that don't seal properly and are letting the flame escape out into the exhaust manifold.
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