I took my car in today for noises under the engine, including occasional shuddering. The noise is increased when I put all four windows down at the same time. The car also runs rough when idling and driving under 5 MPH. I took it to a regular car place, not a German-specific place. They used a Snap-on computer to read codes and found the following codes,
054 - Transmission overload protocol confirm not received
065 - Control module N14/3
120 - R/F vehicle speed sensor from ECM implausible, CAN
135 - CAN communication disturbed - engine management
137 - Transfer case control CAN communication implausible
147 - Gear imp. or transmission slipping
150 - Transmission overload protocol confirm not received
The tech wrote down the following notes,
valve cover gaskets leaking oil on plugs and plug wire connectors
ignition coil #1 cylinder breaking down
Replace: valve cover gaskets, plugs, wires, 1 ignition coil (or 6 ignition coils)
They quoted me $1,600 based on their ridiculous prices for parts. They wanted to charge $400 for an ignition coil. Their labor only price is $641.25 for R&R of valve cover gasket, spark plugs, and ignition coil. They told me I could bring in my own parts if I want but that they would only provide a warranty for the labor (for 90 days).
I'm thinking about replacing the ignition coil to see if that fixes the issue. They said the valve cover gaskets are leaking onto the spark plugs and wires. I couldn't find a good DIY on the valve cover gasket replacement so I'm slightly hesitant to do that work on my own. I'm not too thrilled about spending $700 on the car. What should I do? Also, any easy fix for the transmission/transfer case codes? I don't notice much with those issues although it shifts hard. I'm hesitant to buy a new ignition coil since the check engine light isn't on.
Hopefully some of y'all can help before I waste any money.