Ecumate and Lambda Sensors......

[Hedgehopper]

My 500 is suffering from massive surging and shunting, much worse than the usual. It happens at all rpm but is slightly less noticeable from 3-4000onwards. Ignition has been thoroughly checked and seems OK.

Ecumate shows fault code 44, Left near side lambda sensor faulty.

The actual reading is Lambda A OK 128x and Lambda B Lean Ox

I thought that the suffix 'x' was in itself a fault showing the lambda wasn't oscillating or was in open loop mode?

Should I therefore change both Sensors?

Anyone any suggestions where to buy? Intermotor seem cheaper than usual dealers...any experiences?

PS, In an old Pistonheads thread Blitz refers to fault code 44 as being the offside Lambda...which is correct?

Help will be appreciated.

[Hedgehopper]

Thanks for those helpful replies. I have decided to replace both sensors so the handing won't be an issue.

By the way....do the left and right lambda sensors control the left and right banks of injectors or does the ECU average the readings out and supply the same mixture to both?

I ask this because in spite of a lambda fault on one side all the plugs are the same colour.

[Hedgehopper]

OK, thanks Steve. With one lambda showing a fault I was expecting one bank of plugs to be a different colour.

[Hedgehopper]

'Hedgehopper - Should you have any further 14CUX questions please do not hesitate to contact me.'


Thanks for the offer Steve. I have been trying to email you through your profile but Pistonheads shows an error message when I hit SEND.

I am going away until early next week so will try again then.