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2000 nisson sentra code 171 , keeps coming on about every 50 miles what will fix this
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Your fuel system is runniong
Your fuel system is runniong lean. This means you're getting too much air and not enough fuel. Usually this is caused by a vacuum leak. Listen for a hissing noise under the hood and check all vacuum hoses for a split or if it is disconnected. If you can't find a leak try replacing the fuel filter. I have seen clogged fuel filters cause this code. If you still get the code after that you may have a leaking intake gasket. Nissan's are known for this. You're best bet is to take it to a shop and have it diagnosed if you can't seem to find the culprit.