I really hope any of you can help me now. Have had this problem to battle with in the past months now.
Problem is that the faulty codes "catalytic converter bank 1 & 2" comes up.
As previous read and discussed in threads here I have changed the lambda/CO2 sensors and the temperature sensors for the cats.
As I see it, It is unlikely both cats that not work. Anyhow I have had the cats checked and looked into them and everything seems good with them. They are in good condition.
I have also now changed the "air mass meters", do not know the right name in english, but the units measuring and setting the mix air/fuel.
But I still get the problem that the exhuast gas-values light turns on.
The other strange thing with this issue is that the light turns on after around 160 km (100 miles). That means that I read off the error codes and get the light turned off, then I can drive totally normal and after 100 miles it turns on again. So strange, tried it three times now and get the same result every time.
Should also be noted that before as after the lights turns on, the car goes great, there are nothing strange with how the car acts so it does not "feel" like problems.
Does anyone have further ideas or has been through the same story?
2006 m5 (55000miles)