My own personal “onboard diagnostics” detected a fault code – “B.S.” arising from the dealership service writer.

On a 1994 E420 (124 w/ M119 engine, 88,000 miles) :

I just had the infamous wiring harness replaced (along with the Mass Air unit and few other non-related items) & I specifically asked them to give the throttle slide assembly a good looking over while they were in there – they said it is O.K & sent me along my way.

The car ran GREAT. For about 6 miles. Now, fault code 17 is popping up again, and the dealership service writer says that it is caused by a vacuum leak. Give me a break – code 17 relates to a data exchange fault between modules, but I’m not sure which specific modules, or if this is a general code that requires further investigation to determine which module is having problems communicating. (Throttle slide, anyone?)

Anyone have any comments about this? Please let me know what you think! I’d really like to be barking up the right tree… And maybe, just maybe, it could be caused by a vacuum leak – although I strongly suspect that is not the case.

RTH