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[ordinaryguy]

hi i have a 1999 2.5 v6 omega my TC light and ABS light stay on after I start the car has started when theses light are on my speedo does not work either, when the lights go off if they do ,can be a bit intermittent I get my speedo back ,,ive had it in my local garage 3 times now, they say they have fixed it with different sensors but the problem keeps coming back ,,I don't want to keep throwing money at it any ideas what  this could be plzzzzz,thnx

[Nick W]

Those are the symptoms of ABS ECU failure.

[Bojan]

ABS/TC control unit, located in engine bay.

[Entwood]

Helpful info here :

http://www.omegaowners.com/forum/index.php?topic=90627.0

the ABS ECU can be removed following this procedure...

http://www.omegaowners.com/forum/index.php?topic=132796.0

On the old 2.5 it cost £130:00 to have the ECU repaired, with a 2 year warranty and it was back within a week. That was over 8 years ago however so the prices have probably changed !!

I used BBA-Reman but there are others as well

[ordinaryguy]

thanks is this unit replaceable and where abouts is it situated ,,also would it affect my speedometer when dash lights are on,,cheers

[Entwood]

Info you ask is in the post above yours !!

The speedo gets its info electronically from the ABS transducers via the ABS ECU, so if the ECU fails the speedo fails, as do all other speed related items.. you'll find the cruise control won't work, the steering will drop to minimum assistance (slightly heavier and not variable), as well as the ABS / TC functions you've already seen.

Experience shows that the intermittent nature of the problem slowly, but surely, gets worse until it fails completely. It is of course an MOT failure for ABS and / or Speedo not to work

The main advantage of getting yours repaired is it does NOT need programming to the car, it already is !! If you buy a new one it will need programming, if you buy second hand (and you don't know if that is about to fail) then it has to be the same engine/transmission/body and I think year, if not it will need programming. This can be done with a tech 2 but involves further cost.