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P0030, P0135....P1171, P0302 2001 V70 T5 V70-XC70

posted by  Keith A on  Mon Sep 14 05:32 CST 2009
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last visit: Tue Dec 17 11:53 CST 2013
[RELATED]

A few weeks ago, I had P0302 and P1171 codes come up. replaced #2 coil pack (never noticed a miss) and cleaned the MAF. It was a couple of weeks before I cleaned the MAF. Now, I have P0030 and P0135 - front O2 sensor. Mileage is gone way down and power is way off. I think my 96 855 n/a with 335K will stay even with it.

P1171 has not come back since it was cleared about 2 months ago, but I just cleaned it this week. If the MAF goes bad, is there a default mode that dumps a lot of fuel and could have fouled the O2?

If the O2 goes, I am sure there is a default mode that runs rich and causes fuel mileage to drop. Will it cause the performance to be way down?

Just trying to decide what to replace. O2, MAF or both. Oil is starting to leak quite a bit from the front of the car, so will be replacing the oil trap.

Thanks for the great input!!!

Keith






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