Omega Owners Forum - Strange fault codes

JamesV6CDX

Ex Member

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Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather

Strange fault codes
21. Aug 2006 at 18:46

This question realtes to my 2.5 V6 N reg...

On a drive home from Cardiff this afternoon, I noticed that the Engine Management Light came on for a few seconds, and then went off. Nothing seemed unusual with the car - it was performing fine.

Anyhow, I just thought I'd read the fault codes out of interest, so out came the trusted paperclip,

And with the engine off, I got the codes:

12 (Initiation of diagnosis)

129 (can't find it on topbuzz)

132 (Exhaust Gas Re-circulation (EGR) valve Incorrect signal)

31 (Crankshaft sensor no signal)

With the engine running, code 31 disappeared, so that's not an issue, but 2 questions:

A) What the heck is code 129?
B) What can/should I do about code 132, EGR valve incorrect signal?

Cheers!

James

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« Last Edit: 21. Aug 2006 at 18:47 by JamesV6CDX »

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STMO123 Ex Member Gender:	Re: Strange fault codes Reply #1 - 21. Aug 2006 at 19:34 If the EM light only came on for a very short time I wouldn't be overly worried. It's a complicated system and prone to spurious signals. The drivers handbook says it may happen now and again. I understand your curiosity over code 129 though. One of the brainboxes will be along soon I'm sure.
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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Strange fault codes Reply #2 - 21. Aug 2006 at 21:17 Could be the signs of a failing sensor, such as crank, as this tend to cause spurious codes. Also, just check the battery voltage whilst revving engine is within spec...
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JamesV6CDX Ex Member Gender: Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather	Re: Strange fault codes Reply #3 - 21. Aug 2006 at 21:39 Better not be the crank sensor. I changed it last month for a genuine VX one, £120 odd later
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djx Newbie Offline Posts: 26 rugeley, staffs, uk Gender: Drives: 1998 omega 2.5 v6	Re: Strange fault codes Reply #4 - 22. Aug 2006 at 07:03 i got 129 too, but i dont know what it is
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Taxi Driver Omega Lord Offline OOF Holly Dog Posts: 8413 Swindon Gender: Drives: Fiat Scudo 90 Multijet (whatever that means!)	Re: Strange fault codes Reply #5 - 22. Aug 2006 at 07:46 129.....EGR valve feedback voltage low
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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: Strange fault codes Reply #6 - 22. Aug 2006 at 08:35 James Check your EGR valve connector and wiring loom.....
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v6man54deg Geffd

Junior Member

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V6 man

Posts: 115
Wirral Merseyside
Gender: male

Drives: 3.0l v6 calibra

Re: Strange fault codes
Reply #7 - 22. Aug 2006 at 08:39

As long as the engine management light is not on - the codes are history codes - so not present.
You must have or have had a short on your loom from the EGR valve- check the condition of the loom where it enters the channel on the timing cover - there are a few checks that you can do with a meter - but on one test you need tech 1 in actuator mode - but if the light is not on - then no problem (at the moment)

JamesV6CDX wrote on 21. Aug 2006 at 18:46:

This question realtes to my 2.5 V6 N reg...

On a drive home from Cardiff this afternoon, I noticed that the Engine Management Light came on for a few seconds, and then went off. Nothing seemed unusual with the car - it was performing fine.

Anyhow, I just thought I'd read the fault codes out of interest, so out came the trusted paperclip,

And with the engine off, I got the codes:

12 (Initiation of diagnosis)

129 (can't find it on topbuzz)

132 (Exhaust Gas Re-circulation (EGR) valve Incorrect signal)

31 (Crankshaft sensor no signal)

With the engine running, code 31 disappeared, so that's not an issue, but 2 questions:

A) What the heck is code 129?
B) What can/should I do about code 132, EGR valve incorrect signal?

Cheers!

James

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V6 problems solved

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Matchless

Omega Knight

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Posts: 1746
Nottingham
Gender: male

Drives: The one at the end of the drive

Re: Strange fault codes
Reply #8 - 22. Aug 2006 at 09:12

EGR incorrect signal and feedback voltage low could be due to the valve sticking. The feedback voltage low/high alarms are intended to identify broken or shorted wiring but can also come up if the actuator is stuck at one end of its travel when the ECU thinks it should be mid-way.

You could try cleaning it out by removing it and then filling the valve passages with WD or parafin to soften the carbon deposits then work the valve by hand to free it up.
Very stubborn carbon can be removed with paint stripper or oven cleaner but this is a bit of a last resort as it could also attack any plastic bits inside of the valve

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