After a deluge rainstorm yesterday the wife tells me, the E300D pops the Check Engine Light. There were no changes to the engine or driveability.

I go to Auto Zone and have them run the codes and clear the codes. Ye olde P0200 pops up. Ok, now I have since run 100 miles and no reoccurance.

Is it possible water penetrated the computer housing? I notice the harnesses going into the housing are not water tight.

I want to check the condition of the electronics inside the box, but I need to know if there are any pitfalls to doing so. Has anybody opened up the box?

Also, has anybody experienced anything similar.

The car still got 30 mpg as of yesterday and no hesitation or change in engine sounds or performance.

http://www.carclinicmagazine.com/fault_code_library.html

__________________
ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/

Thanks for the list.

AutoZone OBDII reader only showed P0200, the generic code.

That's a good reference, though.

I'm diving into the computer box tomw