New to me 1997 E300d that quite frankly makes me wish I would have never sold my w124. Here's the issues:

Stalls randomly, usually coming off the freeway, but now sometimes if I'm sitting at a light. Supposedly the K40 was replaced a while back, I've changed the crank sensor. Getting "Check Engine Electronics" message, generic codes of P0200 and P0400. Local Benz shop said no issues with fuel lines of bubbles. I've cleaned the plug to the shutoff valve. Checked K4o and cleaned some corrosion. Re did some solder just for the heck of it. The stall sometimes is when I'm on the freeway, it just dies and give the ETS error, then I have to pull over and put in park. Usually restarts immediately, then I can drive off and it'll either be fine or do it again. Had it do it 3 times in a 10 miles stretch, once at about 30mph, the second time at a stop, and the third at 60 mph. When I was stopped the rpms picked up, then it stalled out. This is seriously a very irritating, maddening problem, and quite frankly, I'm regretting my purchase.

Is it the K40 I've read about? I'd hate to drop $140 for it and then it not be the issue. As it stands, the car is unreliable. When I first got it a week ago, it was fine for a couple days. With each passing day of use, the frequency of stalls has increased.

I thought k38 was starter interlock relay?But are you buying hella crank sensors? the bosch ones are not that good.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

The crank sensor I got was neither, but it was brand new. It does seem to be even more finicky after I pulled the old one

It was a duralast that I installed. Came with the car uninstalled when I bought it.

with mercedes best to use OE parts.I buy off ebay good OE parts way cheaper.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Yeah only reason I used this one was because it came with the car. Might out the old Bosch one back in in the interim

So the question is, Bosch or hella?

What condition is the wiring harness?

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

I think it's ok? Where in the harness should I be looking?