Fault codes are coming up as:

11 Air Injection system
16 Exhaust Gas Recirculation (EGR)
17 Oxygen Sensor signal
18 Current to Idle speed signal

Would cleaning out the idle control valve remedy 18 (Current to Idle speed signal)?
Just saw a video on this, using mineral spirits.

Doing more research and MAS keeps coming up as a possible issue, now remembering the AC/heater/fan doesn't work.

Also, how do I know if I have the 717.4 or 722.4 transmission?
B2 piston replacement also looks to be in order?

sigh. now I'm really missing my old 240D with the manual everything.....

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K