Hi all  

After some advise, a friend of mine has a 2008 1 series coupe n47 177bhp. When driving under acceleration is seems to almost stop boosting, and just bellows out smoke. At first we thought it may have been the MAF or a boost leak of some sort, but when we changed it and searched for a leak it made no difference. We then tried the egr which was surprisingly clean. Which led us to the DPF.

After removal of the DPF it became clear that someone had "gutted" it. Could it be that the previous remap has somehow failed and reverted back to OEM settings, which is constantly trying to force re-gen? This is the only sense I can make of it by the amount of smoke it outputs which is accompanied with a lack of power and eml.

Fault codes as follows 

3F01 

3F25

3FF1 

3F03

P0326 

P0327 

P3624 

any advise would be appreciated 

TIA 

Morning Ash

Welcome to the Forum

What colour smoke ? 

You really need someone with a BMW specific scanner, the codes your seeing are generic so may be a symptom caused by the fault rather than the fault. 

I would check www.newtis.info It is a BMW Technical Information site Dealers use this site for repair and replacement information so you should be able to get test information for sensors etc. 

3F01 Boost Pressure Sensor signal to DDE  Is it the sensor or a split in the intercooler  or pipe work ??

3E25 Indicates an Inter cooler issue

3FF1 Indicates either a MAF problem or the inlet manifold could be blocked/coked up

3F03 Indicates aBoost Pressure sensor issue 

So as you can see 3F01, 03, 25 could be inter linked or 3FF1 could be the cause?? You could spend a lot of hard earned replacing sensors pipework etc

The P0326, 27 codes are knock sensor codes. Symptom ?

The P3624 could be a vacuum leak or a massive air leak forward of the DPF or a faulty IMRC actuator/sensor

Or you could try the old disconnect the Battery for 30mins to rest everything and se what faults return

Hope this helps

Dave