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go to ask.com, or about.com, wiki.com ant type in the following info on address bar or web site: 2003 chevy avalnche 5.3 code po343 and it will give you an answer if the code has every been searched for.
I would say duralast. Most chevy people use it. It is a good dependable battery. When you take the old one in, just make sure you pick the same size and side post kind.
the sensor is located at the back of the top of the engine, behind the distributor. Could be the sensor or the gauge itself. Probably the sensor stuck.
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