keep causing a skip or lugging code P0171

buckbass · 2012-05-02T00:16:35+00:00

Had a code P0171 only and repaired vacuum leak. What could keep causing a skip or lugging type feeling driving the vehicle after repairs to leak and can I fix it? I have a 2003 Ford F-150 and just recently it started running rough like it wanted to stall out at stops and had a skipping type feeling while accelerating. I had a parts store check the check engine soon light and a P0171 code appeared. I found a vacuum leak at rear of intake at the elbow on the pvc valve hose. I replaced the hose and cleared the computer and it still has the lugging or skipping feeling while accelerating. I would appreciate some help if you don't mind on what you guys think it can be. I don't know if cleaning the maf sensor will help or not, truck was running great until the vacuum leak started and I really do not have the money because I have been out of work for over a month because I was diagnosis with terminal cancer and had my left kidney removed and cancer is in my right one as well but just has started attacking it and there is no cure for my type of cancer. Sorry to bother you guys with my personal problems but any help would be very much appreciated because I'll be doing this myself. Thanks!

2003 FORD F-150

177,000 MILES

BLUELIGHTNIN6

✓Experienced Mechanic
16,542 POSTS

honestly at this point in time, i don't like to tell people this, but I honestly think you will be better off taking it to a dealer instead of spending so much time and causing such a headache over it.

Dec 13, 2020 at 5:19 AM (Merged)

DGEORGE C

MEMBER
1 POST

Check for exhaust leak. A broken off exhaust stud near the front O2 sensor can cause a lean code on just one bank (usually P0171). Bank 1 Sensor 1 is the upstream oxygen sensor on the passenger side of the engine, mounted in the exhaust manifold just before the catalytic converter. Somebody earlier said bank one was the drivers side but that's not correct. BLACKOP555 said to check for exhaust leak on the first page but no response whether it was done or not. There are no dates posted on this thread but maybe will help someone else.

Sep 27, 2026 at 6:11 AM

STRAILER

✓Experienced Mechanic
55,433 POSTS

Yep, this will help nice input!

Sep 28, 2026 at 4:31 PM

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