P0172 / P0175

[Crazybug]

Hi everyone, I bot our 2003 bmw z4 3.0 last summer and since the begining i got those 2 codes coming up (P0172/P0175).
the car as a supercharger in it and came with out any cathalityc convertor .
so far this is what I have done to it to try to result the issue.

-Replaced the mass air flow sensor.
-Install a set of cats.
-Contacted the supercharger company and they told me that I have the current software that is being use.
-Check for any air leak with a smoker.

And the codes are back.

Anyone as an idea what's next, or anyone had this issue in the past?

Thank you.

Sebastien.

 

[Haro]

It's heavily modified and the map will be different to adjust the fuelling to match. Have you pulled the plugs to see if it is rich? I take it the lambdas were in straight pipes before you fitted the cats? The length is important and even after market cats can cause problems. Supercharger is ok and boosting at the right pressure? Live data would give you a much bigger head start than stabbing around.