W210: Daily Diesel, K40 Replacement

So, K40 replacement on a W210 is done to cure random stalling, no start conditions, etc. It feeds power to the main engine computer and a variety of other systems on the car. In my case, random no starts that, with a few turns of the key, would start and the occasional random stall. Was hit or miss when it would happen. At the bottom of the post, I have a sheet of codes that were thrown when I had my Xentry hooked up to the car.

No reason to NOT go through Mercedes for this part. Will cost you around $120, don't fuss around with used parts....

Part number 210 540 0372 was the one I needed for my 97 E300 Diesel

Process is very simple. Grab your finest philips head screwdriver and unscrew the 4 fasteners located around this cover.

You'll expose a bunch of computer modules - the one I'm pointing at is your K40.

Here's mine up close.

Pull back this little tab and wiggle your relay out. Reverse procedure and you're good to go. Don't even need to disconnect the battery. 10 minutes is the longest this job should take!

Here's a pic of the codes that popped up on Xentry. CAN interuption seems to be a common theme here. So far it's been a few weeks and I've hadn't had the car do anything out of the norm. Which is good, because it's going to be going on a cross country journey. Legit cross country.... 5-6k mile journey.... Oh great. I'll try to document it like I did with the 500SL 6.0 AMG trip.

Codes related to stalling:

IFI - P1221 - CAN Reception from ASR/ETC/ESP
ETS - C1022 - CAN Interrupted with ME N3/10
ETC.6 (transmission) - 132/135 - Engine Management Implausible/Interruption
IC - B1040 - CAN communication fault to ECM
IC - B1041 - CAN communication fault to Traction

Codes being cleared and about 30 "trips" run through the system with no fault signs.

Disregard my ECM fault writing down below - I have some sensors to renew throughout the car while I'm doing other work that will remedy my problems.

Anyhow, thanks for reading.