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Recently my serpentine belt snapped off from an oil leak. I repaclaced the pulleys and belt which is now fine. However the leak was major and it costed me $1500 to fix the oil gasket housing, cover and vanos sensor. A few days later I’ve been getting an engine oil pressure is too low alert and engine malfunction light. Also the car now makes a rattle sound under the hood when accelerating. Spoke to a bmw specialist and he said the belt residue may have got sucked into the cam shaft. Read 3 codes and they are p1339 p0171 p112f. Any advice or help a greatly appreciated.
 

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Well, actually it got sucked through the crankshaft seal. Sorry, but your engine will now require at least a partial rebuild.
 

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For sure..?
What IS for sure is that you have a serious problem and should NOT even start your engine until you understand what can happen due to a shredded belt.

It is NOT "for sure" that you have damaged the bearings, rings, etc. YET, as the clicking/clacking MAY be lifters due to low oil pressure but NOT ZERO (0) oil pressure -- MAYBE -- IF your are lucky.

Several things can happen when a belt fails: (1) It can simply fly off with a single thud and no side effects (unlikely with all the twists & bends of these "serpentine" belts). (2) It/ parts of it can get wrapped around the crankshaft pulley and get swung around in circles by the crankshaft, slapping into components on the front of the engine such as the camshaft sensors, VANOS solenoids, CTS, etc. OR their connectors & wiring, causing other faults. (3) Worst of all, the belt gets shredded and wrapped around the crankshaft BEHIND the Crank Pulley in such a way that portions of the belt penetrate the front crank seal and get sucked into the crankcase, where they can clog the oil pump pickup screen, preventing proper oil flow to the crank bearings, Camshafts/ bearings, and VANOS units.

I hope you carefully examined the failed belt, what it was wrapped around after stopping the engine, any signs of impact of the "swinging" belt to other components on the front of the engine, and CAREFULLY inspected for any belt fragments between the rear of the crank pulley and front of the crankcase. IF NOT, you should do so NOW. Even if you DID, do so AGAIN.

What you need to do BEFORE starting the engine again is visually inspect the front crank seal for ANY sign of damage, and unless you can confirm that it is intact 360 degrees around, ASSUME that some belt fragments are at least partially, if not totally plugging the pickup screen and preventing oil flow to bearings, etc.

Your original post raises serious issues about any 3rd party liability if you took the car to a shop and they failed to address the issues above (assuming you gave them the history).

So start with front seal inspection, and a careful record of events, and then post back with your findings and data, and someone can perhaps help from there. Also let us know what code reading/clearing device(s) and software you have or have access to, and whether you want to try to diagnose the problem yourself or have the vehicle flat-bedded to a shop.

Codes reported, per Bentley descriptions:

P0171 29EO System Too Lean (Bank 1)
P112F 2D2E Manifold Absolute Pressure to Throttle Angle - Too High
P1339: ??? NOT found in Bentley, but Google search suggests damage to Camshaft sensor, connector or associated wiring (in your case, from swinging belt)
Do NOT clear codes. Try to find any Freeze Frame Data or Error Detail (INPA) that indicates when (mileage) first two codes were set, as they may NOT be related to the belt incident. Also check for any wiring loom or insulation damage (on the front of the engine or where wiring harness goes under coil cover) by swinging belt.

Of course IMMEDIATE concern is belt ingress to crankcase via front crank seal & proper oil pressure.

Good luck,
George
 

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Recently my serpentine belt snapped off from an oil leak. I repaclaced the pulleys and belt which is now fine. However the leak was major and it costed me $1500 to fix the oil gasket housing, cover and vanos sensor. A few days later I've been getting an engine oil pressure is too low alert and engine malfunction light. Also the car now makes a rattle sound under the hood when accelerating. Spoke to a bmw specialist and he said the belt residue may have got sucked into the cam shaft. Read 3 codes and they are p1339 p0171 p112f. Any advice or help a greatly appreciated.

I'm really, really sorry to tell you, $1500 now may be chump change. [click me] ---> Prepare for the worst.

To confirm or deny, pull the oil pan; hafa look. Post pics either way!


 
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