just bought used 129Kmiles for daughter, dealer replaced sensors, then engine light on, he took to his mechanic who said he fixed all the fuel air ratio had it all day tested w his machine, now engine light on and took to Autozone today, pulled up many codes, car drives well but think we should return to used car dealer, we don't know what to do but can't put more into this car, just registered it and replaced belts and bought it a month ago
 
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Ask Your Question2001 Toyota Camry
Question: failed emiss's sensors replaced engine lite on codes P0171 P0300,0301,0303,0304
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