1996 Volvo 850 2.5L Automatic. 175K ish miles (Odometer intermittent). I used a Matco Scan Tool to pull the codes. 2 are shown:
PO172
P0440
Looked them up, not sure how to continue diagnosing problems.
All help or recommendations welcome and appreciated
'96 850 Check Engine Light
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Sommerfeldt
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Hello!
Both of those point to a vacuum leak in my mind, at least. Check your hoses and replace. For the 0440, it can be an idea to go over all hoses and fittings in the evap system, and also replace the valve.
- S
Both of those point to a vacuum leak in my mind, at least. Check your hoses and replace. For the 0440, it can be an idea to go over all hoses and fittings in the evap system, and also replace the valve.
- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
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WhatAmIDoing
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In my experience, P0172 is always caused by a severe vacuum leak. Check your vacuum lines. With the engine running, you might be able to hear a wooshing or hissing sound to help you track down the leak. What rpm does it idle at?
P0440 is usually the J and L hose on the charcoal canister. Replacing the lines on the evap system may solve your P0172.
P0440 is usually the J and L hose on the charcoal canister. Replacing the lines on the evap system may solve your P0172.
'98 S70 T5M - 323,000mi - awaiting heart transplant 
'98 V70 T5M - 324,000mi - my new project
'99 S70 "AWD" - 220,000+mi - gone
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'98 V70 T5M - 324,000mi - my new project
'99 S70 "AWD" - 220,000+mi - gone
Knows enough to be dangerous
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misha
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Non turbo with auto transmission and in "D" idles at 1000rpm.
While in P or N it will be around 900rpm.
N/a manual around 900...Turbos a bit lower...around 800+-50.
While in P or N it will be around 900rpm.
N/a manual around 900...Turbos a bit lower...around 800+-50.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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