P0171 The Worlds most annoying code
Junior Member
Joined: Jul 2024
Posts: 1
Likes: 0
Had the same issue with my 06 volvo s40 2.4i
I had the same issue last year. I had a bad PCV valve/oil filter housing unit. I replaced it the oil filter housing unit and the issue went away..
at 1st I thought bad 02 sensor. Then I took the lid off for the oil and had ALOT of pressure and a whistle.
Replaced the unit on amazon i think i paid $150 and did it myself. Was a 45 Min. Job and haven't had a issue since.. remember if you do the pil filter housing unit with built in pcv valve you must tap the unit with the original screws it comes with. Do it outside the car on a flat surface to be straight. Then install..
Good luck
at 1st I thought bad 02 sensor. Then I took the lid off for the oil and had ALOT of pressure and a whistle.
Replaced the unit on amazon i think i paid $150 and did it myself. Was a 45 Min. Job and haven't had a issue since.. remember if you do the pil filter housing unit with built in pcv valve you must tap the unit with the original screws it comes with. Do it outside the car on a flat surface to be straight. Then install..
Good luck
I agree but troubleshooting the exhaust leak I have come across another possible issue. When the engine warms up and I take off the oil cap I can feel and hear some pressure being released. I have header of this problem with volvo's so two problems that need to be fixed.. Exhaust leak and pcv/oil trap issue
Thread
Thread Starter
Forum
Replies
Last Post