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A couple of days ago I got a CEL, pulled the code and I have a P1131 which says "Lack of upstream heated oxygen sensor switch - sensor indicates lean - bank #1" Ok, but where should I start looking, bad oxygen sensor? Which side? Could this be causing real bad gas mileage (prior to CEL coming...

My daughter has an 01 with an automatic and 140k, she is having a problem that every so often when she pulls up to a stop, the engine will start to studder and then just dies. Wait a moment and it restarts without any further issue, no CEL showing. I thought that it may have an issue with...