Volvo AWD 850 Forum

This site is useful for Pnnnn codes: http://www.actron.com/code_lookup.php

P0422 = O2 sensor for cat below thresh hold
P0412 = SAS valve error, secondary air system

Neither have anything to do with the MAF/AMM sensor. Is this a Volvo shop you went to?

I would first check the hoses going to the SAS valve, any cracks and replace the hoses first.
Then check other vacuum elbows for leaks to clear up the P0422.

Klaus
--
Volvoless. Sold the R. There is now a void...

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Translating Codes 422 and 412 850 1997

posted by Torque on Wed Dec 3 08:50 CST 2008
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last visit: Fri Aug 1 10:12 CST 2014

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It's with my usually reliably Indy guy who does a lot of Volvo's, but not exclusively. I just called him and asked about the P0422 and he says no, it's just a Volvo code 422 and he knew that P0422 was about the cat converter. He sounds like he knows what he's talking about and I have been taking my 4 volvos to him for years. So I think we're on the right track. He is replacing a couple of old hoses and then we'll see if the code(s) come back.

Thanks Klaus for your help.
--
1993 240 Classic

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Translating Codes 422 and 412 850 1997

posted by KlausC on Wed Dec 3 09:07 CST 2008
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last visit: Fri Oct 24 10:15 CST 2014

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If your mechanic has a Volvo scan tool, great!! But there is no Volvo 422 or 412 code number.

Klaus
--
Volvoless. Sold the R. There is now a void...

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Translating Codes 422 and 412 850 1997

posted by Rule 308 on Fri Dec 5 03:57 CST 2008
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last visit: Tue May 8 09:20 CST 2012

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I have to half way agree with Klaus on this one. There is no listing for a 412 code in the Volvo service manual for that system. There is a listing for the 422 though and I just had a car in yesterday for that code, first time that I can recall seeing it in all of the years I have worked on them. It is listed as an "atmospheric pressure sensor" code. Bad pressure sensor like you see in a lot of the later model cars. I swapped it out and it was good to go.

Good luck,
Mark

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Update 850 1997

posted by Torque on Thu Dec 4 03:20 CST 2008
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last visit: Fri Aug 1 10:12 CST 2014

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To follow-up, he changed out all the little hoses because many were cracked/old, reset the check engine light and hopefully that will forestall needing a AMM.

Regarding the codes, he works on a lot of Volvos and showed me how the reader gives him the AMM message. So I am confident he is correct (until proven otherwise, as usual!).
Thanks again Klaus for your assistance.
--
1993 240 Classic

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