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Old 01-03-2012, 01:00 PM   #1
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check engine light

I got two codes p1401 and p0174
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Old 01-03-2012, 01:04 PM   #2
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Re: check engine light

aux emissions control & system two lean (bank 2)...both codes can be for the same issue...which is looking like an upstream o2
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Old 01-03-2012, 01:15 PM   #3
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I have had the lean banks for awhile. One time it was the wire came off the spark plug. The car runs fine but I think you could be right should I only change one or both
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Old 01-04-2012, 03:30 AM   #4
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Re: check engine light

-Clean the MAF sensor
-Seafoam the upper intake manifold
-Accidentally pulled out my pcv valve last week and got the same code.
-Check for tiny vacuum leaks around EGR & vicinity.
These suggestions have eliminated the same code for me once or twice over the last 5 years or so. Might be the culprit, might not. Just hope that it might help you out. Good luck.
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