I keep getting the dreaded P0491 & P0492 on my 2002 325i. Before doing anything serious I was wondering if anyone knows of a diagram of the lines to the pump etc. If there is a break in the line, I'm wondering the best way to find it.
Well you have the pump, line, vacuum hose that go around the back of the head to the rear of the intake manifold where there is a switching solenoid,,that's it.
M54 or M56?
Not sure if it is M54 or M56. The air pump is on the front left of the engine if that helps.
Need the last 7digits of your VIN#
The m56 engine has a hinged engine oil cap that you can't remove when adding engine oil the m54 has the normal oil cap you can remove
The back of the engine is completely inaccessible. Are there any trick to getting back there to see if the lines are cracked or disconnected? Does the switching solenoid go bad often? How do you access it?
Pop the cabin filter assembly off, there's I think 4 torx bolts at the top undo those and it will pop off. Right side heat shield would help a little too, lift the gasket off, lift the brake booster line and the wiring harness out and there's two clips holding it in.
New Daily:
2011 Audi A6 Avant 3.0T prestige. 1 of 368
----FOR SALE-----
04 BMW 325xi 143k
The Fun car:
94' BMW 740i 308k miles
Fresh 72k mile engine with all new seals. True E34 Manual Trans Engine Harness. 6spd Transmission Swap, Getrag 420G. RHD LW Single Mass Flywheel. E39 M5 Clutch. E39 M5 Shifter. Factory Car Phone. Factory 6CD Changer. Factory Electric Sunshade. Not So Factory Factory Electric/Heated Rear Seats. E38 Heater Valves. E43 M5 calipers/brakes
Sold:
1996 Oldsmobile Aurora; 194k miles but with a bad paint job and dented fender resulting in a payout to buy the 740i
Bookmarks