[mgcorreia]

Hello all, this is my first post. I have a BWM x3 2005 3.0L with about 180k miles. Writing in because i've been battling these p0171 p0174 codes on my car. I've replaced a lot of parts so far in perusing this:
*new valve cover gasket
*spark plugs
*coils
*cleaned the MAF
*New air filter
*New throttle body boot
*New ccv
*new disa

This certainly fixed my misfire, its running much better but still the p0171 code comes on every couple of days, sometimes paired with a p0174

Some observations: that little MAF sensor is black even after cleaning it, shouldn't it be amber colored? Could it be the 02 sensors? The baffle on the exhaust rattles is that related? My fuel economy used to average around 18mpg, now its around 17mpg. Open to any suggestions on what to try next, this is an otherwise awesome reliable car. thanks!

[X3MS]

Those are EGR Valve codes. Your EGR Valve is most likely all gummed up, causing insufficient flow, and needs to be cleaned or replaced.

[mgcorreia]

...oh and a new DISA too, those seals cause leaks.

Thanks x3ms! this is the component that needs cleaning correct? any advice on how to clean it or what to use?

https://www.pelicanparts.com/More_In...=0&SVSVSI=0589

[X3MS]

Originally Posted by mgcorreia

...oh and a new DISA too, those seals cause leaks.

Thanks x3ms! this is the component that needs cleaning correct? any advice on how to clean it or what to use?

https://www.pelicanparts.com/More_In...=0&SVSVSI=0589

That part looks correct. Which engine are you running... M54?

[mgcorreia]

yup m54

[X3MS]

Originally Posted by mgcorreia

yup m54

Ok, then this will be pretty straight forward.

[mgcorreia]

Oh damn my dyslexia ... the code was p0171 & p0174. So sorry. That could be anything right? I will for sure clean the egr though, it’s never been done.

[hfount]

Hi mgcorreia,
I have the same exact car as you with the same codes.
Were you able to fix this? thank you, Harry