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Can't clear CEL (check engine light) Topic is solved

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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lext
Posts: 68
Joined: 25 January 2005
Year and Model: 1994 854
Location: Northern California
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Can't clear CEL (check engine light)

Post by lext »

I had some vacuum hose problem a while back. All that is gone now, and I've don't have any code for socket A1 (trans) and A2 (engine). Yet the check engine light still remains. Do I have to clear all the codes from all sockets for the light to go away? I have ABS codes but I had them for years before and it didn't lead to CEL.

I'm aware of the procedure: that to clear CEL, I have to use socket A2 and press 6-7 seconds, wait for red light then press another 6-7 seconds. I used this procedure to clear the code on A1 successfully. For socket A2, it had a code before but after I fixed the issue, the code clears off on is own. Both sockets now give me 1-1-1. And yet the light stays on.

Is there a hard-reset option somehow? Mine is a 1994 and I interact using the "control panel" under the hood on the passenger side.
94 850 non-turbo
2011 S40 T5

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WhatAmIDoing
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Post by WhatAmIDoing »

Have you tried disconnecting the negative cable from the battery, pressing the brake, and waiting 30 minutes? Should discharge the entire system and clear everything from the memory.
'98 S70 T5M - 323,000mi - awaiting heart transplant :shock:
'98 V70 T5M - 324,000mi - my new project
'99 S70 "AWD" - 220,000+mi - gone :cry:
Knows enough to be dangerous :wink:

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misha
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Post by misha »

Check codes from A6(ignition module).
'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

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lext
Posts: 68
Joined: 25 January 2005
Year and Model: 1994 854
Location: Northern California
Has thanked: 1 time

Post by lext »

misha wrote: 05 Jun 2018, 22:53 Check codes from A6(ignition module).
Yes, this does it. Thank you!
94 850 non-turbo
2011 S40 T5

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