[emerald8779]

Hey everyone i have a problem, i bought a 2011 535i a year ago while i was in Germany, i've got a TUV inspection coming up and i failed the CO2 emissions test. I figured it was tune related as i know it had a custom tune on it (No idea what tune, but MHD did say it was a custom MHD tune?). Car runs perfectly fine, so i proceed to buy mhd to flash the stock tune and i find that it goes into limp mode without any dash warnings but the codes i get are

20A909 - BSD, Message; electric cooland pump: Missing
20AB08 - Engine cooling system: no emergency operation signal at coolant pump.

Mind you i can hear my waterpump, car runs fine and doesnt overheat. I just completed a 200 km trip the previous day.

So i reflash the stock tune again, to no avail

I proceed to try Stage 1 and it runs fine again but the codes are still there.

Any ideas on whats happening? Thanks!

[emerald8779]

Bump

[CoffeeBean]

What if you flash it to stage 0? Stock tune but MHD still installed.

Maybe a German market car has different emissions than AUS market? Also if it's tuned, there's a possibility it has an aftermarket downpipe on it (catless or high flow cat), either of which would definitely fail.

[emerald8779]

Thanks for the response. Update:

Installed Stage 0 a couple days ago, that works.
Drove around for a couple hundreds KMS and re did the test and got a worse score. I am suspecting someone bashed out the guts of the Cat, i was told its stock by two mechanics but i would not be surprised if they didn't check the inside (my luck).
I did say to both mechanics it does sound (literally sound) like the cat was empty. I will book it into a workshop this week and also mention the problem about the limp mode and post back. I don't have any equipment here in Europe to do it myself.

[CoffeeBean]

Sounds like it could be. Can you compare the sound to a known stock exhaust 535? It will be noticeably louder without the cat.