Lamda sensor fault code... Weird...

[Paul in NZ]

Bad_Manners - No Check Engine light, but performance isn't what it used to be. It's interesting though that it used to perform well... but gradually got 'less good'.

Ferret - I will defo check on the EAT chip. We've had this conversation before I think but it works and no CEL so I haven't bothered so far - Will I need to talk to Mark D over this? It seemed to increase performance when I put it in but it is since after I got the chip it has been getting worse now I think about it. I will try putting the normal chip back in and see how it goes too. I could see nothing at all looking all the way down the exhaust in terms of wiring, and no sign of a cat. It's weird then that it's throwing that code isn't it... I'm a little worried to be honest!

Whisky!!!! - Hey there 'friend' (I'm not a billy no-mates anymore ), Mine is 01/08/1990 build and the CAT shows up on RealOEM for me which is very, very weird. I can't see the machine giving us wrong info... Was the dogs b*llocks!

I'm freaking out!

mine is also a non cat car but it doesnt say it NOT having one on real oem

[e34.535i.sport]

mine is also a non cat car but it doesnt say it NOT having one on real oem

Hey thats good to know, now I'm just wondering why it threw the code... Could have had a vacuum leak before I got hold of it I suppose, but I don't know.

[whiskychaser]

This is bugging me - but I like puzzles so does this sum it up? :
1. You dont get a CEL.
I would say you never will cos they arent connected on Euro spec cars
2. We got code 28
Either my kit is up the wall or the DME is throwing a wonky code.
( I asked my local BM place if they had heard of it - chocolate and fireguard come to mind)
3. Its better if you disconnect battery or wipe the code - for a time.
Something is telling the DME there is a problem. Maybe check the input at the DME pin where the O2 signal is supposed to go? I know the reading is roughly 450mV but that may be AC. (If it is, you can block the DC element out ) Maybe someone can confirm?

[e34.535i.sport]

This is bugging me - but I like puzzles so does this sum it up? :
1. You dont get a CEL.
I would say you never will cos they arent connected on Euro spec cars
2. We got code 28
Either my kit is up the wall or the DME is throwing a wonky code.
( I asked my local BM place if they had heard of it - chocolate and fireguard come to mind)
3. Its better if you disconnect battery or wipe the code - for a time.
Something is telling the DME there is a problem. Maybe check the input at the DME pin where the O2 signal is supposed to go? I know the reading is roughly 450mV but that may be AC. (If it is, you can block the DC element out ) Maybe someone can confirm?

Hey - thanks to going to all that trouble for me! I wouldn't even bother ringing the dealership here in Liverpool - They have no idea what you're talking about half the time... And that's when you've only got as far as "Hello"... LOL!

Checking the input sounds like a plan if it degenerates again, as it has been better since we reset it (I had disconnected the battery a week previous)... I might have to ask for your services again on that one though??!!! I'll bring the Clay bar down and shine up the whiskymobile in return of course [That's as far as my skill goes!!]. (In response to previous comment - no offence meant at all! )