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P0171 means "system lean, bank 1". That could be caused by a number of things, vacuum leak, exhaust leak, bad O2 sensor, dirty/bad MAF sensor, dirty throttle body, or even a misfire could cause the computer to think the engine is running lean. Are there any other codes? Any other drivability issues? How many miles on the car? Any work done recently before the light came on?
 

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Discussion Starter #3
Sisters car no works been done besides a rear trailing bar. Bone stock no mods. I cleared the code and rite when she took off drove around it came back on. MAF looked like it had mud or something on it took forever to clean. Replace air duct tube hers was giving off alot of black and crumbling every where. Then i cleared it and she said it hasnt came back on and doesnt run crappy anymore....So hopefully its good to go
 

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Wrong Forum. :tongue:
 
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