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P0171 code Volvo 850 GLT (97) 850 1997

posted by  Shaughnessy on  Mon Dec 14 21:12 CST 2020
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last visit: Fri Oct 3 23:53 CST 2014
[RELATED]

I've been chasing a CEL code for a while now, a P0171.

I used to have an occasional rough idle, but it went away with a vacuum leak repair...but the car pretty much runs normal right now.

I replaced the MAF Sensor about 20K miles ago, same with the Spark Plugs.

I replaced both O2 sensors recently, and have checked and re-checked and re-checked for vacuum leaks (replaced a few elbows which I thought were clearly the issue, as they were split in two). The rest of the vacuum system seems to be fine, but I will check it again tomorrow.

My gas mileage really hasn't suffered any noticeable drop off.

The OBD2 scanner says:

"Intake leak after Mass Air Flow (MAF) Sensor.
Restriction in Fuel System
Spark plugs have excessive wear
Faulty Bank 1 Sensor 1 Oxygen sensor"

It's not saying those are ALL wrong, I think it's the generic "these are the common issues".
--
1985 245. 246K Gone..but not forgotten. Sold in 2013, found 2018! Still running on the road. Of course. 1993 Volvo 850 soon to be gone






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