Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: peter murray on 21 November 2011, 16:01:24

Title: ECU Limp Home mode
Post by: peter murray on 21 November 2011, 16:01:24

Occasionally the car goes to Limp Home mode and a warning light which looks like a car with a spanner comes on. If I turn off the engine this will normally clear the fault (as per the handbook). The fault usually comes on after a long drive.
Having looked round the forum I saw a post which said that a failing knock sensor could be the problem.
Can anyone help?
The car is 3.2 Elite 2003 model.

Title: Re: ECU Limp Home mode
Post by: RobG on 21 November 2011, 16:03:44

Do the "pedal trick" and post up the codes
http://www.omegaowners.com/forum/index.php?topic=90581.0

Title: Re: ECU Limp Home mode
Post by: peter murray on 21 November 2011, 16:45:45

DOING PEDAL TRICK SEEMED TO GIVE THE FOLLOWING SEQUENCE OF FLASHES:

10 4 2 10

HOPE THIS MAKES SENSE AS IT IS DIFFICULT TO COUNT!

THANKS AND REGARDS

PETER MURRAY

Title: Re: ECU Limp Home mode
Post by: woodoo on 21 November 2011, 17:16:31

0420 catalytic converter system, bank 1 - efficiency below threshold. Problem cause: Catalytic converter, wiring, lambda sensor(after cat). Hope this helps.

Title: Re: ECU Limp Home mode
Post by: TheBoy on 21 November 2011, 17:21:19

Good job you didn't waste money on that knock sensor - another lesson in not changing stuff on a hunch ;)

0420 (and 0430) plague all 3.2 engines.  Ultimately, the solution is to move the rear lamdas behind the main cat. Costs about £15 and a couple of beers to your welder mate ;)

Title: Re: ECU Limp Home mode
Post by: tunnie on 21 November 2011, 17:34:48

Yeah the pre-cats fail, sensors need moving post main cat  :y

Title: Re: ECU Limp Home mode
Post by: TheBoy on 21 November 2011, 17:37:28

Although this code should not give any form of limp, it just brings light on...