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Error Code 171


 
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mittens
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Joined: 06 Feb 2011

PostPosted: Sun Feb 06, 2011 10:54 am    Post subject: Error Code 171 Reply with quote

OBD2 error code is 171, indicating the system air/fuel mixture is to lean.
What should I be looking at or for?
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Toliver09
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Joined: 16 Oct 2007
Location: Central Illinois

PostPosted: Sat Feb 12, 2011 7:00 pm    Post subject: Reply with quote

a lean mixture could be a number of many things. First things first, change your fuel filter, it's a cheap part and you'd be surprised just how essential a clean fuel filter is. If it is still running lean after the filter change, check the throttle position sensor. Check the tps by connecting the leads of a volt/ohm meter (set on OHMS) two of the three pins, I believe it is the outside pins. You can check this with the battery unplugged, no harm done. use a small flat blade screwdriver to slowly turn the wheel on the sensor and check for erratic jumps in the reading. if there are jumps, the sensor is bad. normally if a map sensor is bad, it will run like crap and barely idle. I don't know for sure if either of these will help you, but it's a place to start.
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