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Hi everyone, a couple weeks ago my 550 decided not to start, and the issue seemed to be with one or both of the Motronic 5.2 ECUs. I sent them off to Specialized ECU repair in Oakland, FL, and both ECUs passed all of their diagnostic tests, minus a visual inspection that found a cold soldered resistor on the 5v power circuit in one of the units. They resoldered the resistor, but it did not change any of the diagnostics. Before they send them back to me, they would like to test my ECUs in a known working car to help identify if the ECUs need a complete rebuild, or if the issue is somewhere else in my car.

If you have a 550 in the Broward County area, or if you are nearby and would not mind making the drive to Specialized ECU Repair’s offices in Oakland, FL, I would love to make it worth your time as this would help me get my beloved 550 back on the road.

Thank you!
 
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