[QUOTE=jp99;187754]Quote:
Originally Posted by ThrasherFan
Seba/JP99,

I've got the same 2 crankcase vent hoses at the back of the engine on my 4.4 that have deteriorated and causing Mixture Control faults. Did you replace these on your own? If so, could you share how you were able to access these hoses for removal and replacement?

Thanx!

I also experienced two faulty codes on my 2001 X5 4.4i and I never knew if these hoses in the back of the engine could have been the cause. After several other tests: cleaning (Air mass sensor, checking some other vacuum for leakage and replacing all 4 O2 sensors, but still having those two ignoring codes alone: P0171/P0174 and unable to detect where this leak is coming from.

Now, as I look @ those hoses behind the engine, one of them which is the big one seems to be pretty muggy, slightly melted flat. Now I'm very focusing on replacing them and the fuel filter gas as they might be the issue for those two codes (P0171/P0174) wish someone would post a few pic on how to access behind the engine @ those hoses.


The center plastic component just above those hoses comes off - it holds the pollen filter and, at firewall, fits into two ventilation ports. Once off, you have ready access to the back end of those rotten hoses.

1. Pull the long rubber gasket that seals the area - runs parallel to the firewall the width of the engine compartment.
2. Pull rain catchers (or whatever they are) on each side of the pollen filter area - pull straight up - each is about the size of your hand - they are snap-in, vertically.
3. Locate large nut that holds your battery positive cable in place - locate similar nut on the other side of the engine - that one does not appear to hold anything. Remove nuts, pull the plastic housing straight back off the bolts and lift out. Bolts will stay in place. That center housing, with pollen filter on top, comes out as one large piece - note how it fits back in at the firewall.
4. You should have easy access to the back ends of those hoses. In my case, the back ends had standard BMW hose clamps while the front, top ends had crimped clamps. The crimped ones come off readily with a screw driver to pry at the crimp point or, better, pry the wrapped part of the clamp up and back.
5. Replace hoses, reverse assembly procedure. I bought the two hoses at local dealer and got, also, two clamps to replace the crimped ones.

Ran quieter and smoother, took care of P1159 and P1161 fault codes. The replacement hoses are modified from the original but the parts guy had no idea if they were any better. I doubt it - looks like something that needs to be done every 4 or 5 years.

Good luck - post back if you have a problem. Fun project.