That's the cam sensor.

You said in your original post that you've had trouble with this and that "almost" every sensor is new, so I'm assuming that that's one of them. You also said you've replaced the engine wiring harness three times. I was getting weird codes about voltage levels being implausible and just by chance had to replace the lower engine harness (the one with the positive battery lead), after which these codes disappeared; I suggest that you check the condition of the lower harness.

Best Regards,
Rob

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Robert Fini

'12 ML350 BlueTec, 100k
'06 E320CDI (x2)
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k
'97 C36AMG, 319k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)

The lower harness is new. I have an oscilloscope but have no idea how to use it to check the output of the sensor. I’ve swapped the cam parts from my 94 to see if things change but no change. The only thing I haven’t changed was the ecu.

MAybe the ecu is fubared from the po driving for such a long time with bare wires touching everything?

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero