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85T5 Check Engine Light and Sucking Sounds

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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nc volvo
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Joined: 1 August 2004
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85T5 Check Engine Light and Sucking Sounds

Post by nc volvo »

Check engine came on a couple of weeks ago. Tech says code suggests one of the two O2 sensors is bad (I didn't even know the wagon has two). Reset light. About the same time, I noticed loud vacuum sounds coming from front left wheel well. Sounds constant most of time - only occasionally do I not hear this. I'm assuming it's related to the charcoal canister. Are these two phenomena related and what would be the most strategic corrective path for diagnosis / repair? Any suggestions will be most appreciated!
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csbrianp
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Post by csbrianp »

I'm not sure what year you have, but I experienced the same type of sounds from my 850 turbo. If you have an early 850 94 -96, you can read the codes up in the front of the car (see front page of this site). If you have a newer car take it to an autoparts store and have them read your codes (it's free). After I replaced the front O2 sensor, I still had the problem and it turned out to be a bad Mass Air Flow sensor.

Hope this helps,

Brian
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