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Q: Engin error light code indicates engine running lean. on 2002 Mazda Protege

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Where do I find what should be checked and in what order. Also, what would the cost range be for repair shop fixing problem?
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Here's some info on the p0174 and p0171 codes that normally occur when the engine is running lean: http://repairpal.com/OBD-II-Code-P0171-and-P0174
A shop will likely charge about an hour of labor to diagnose this, maybe less but maybe more, depending on the difficulty in finding the problem.
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