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As others say, ok f maybe it's a genuine "never seen that before", but when you have worked out what the issue is, and then insist that you'll never look for that issue again, that's mental.
Surely any mechanic would take what they have learned and use that info in the future, not ignore it, because reasons.
Anyway, yes seen and have a German car where the electrics are all in a not particularly well made plastic tub right under the scuttle panel, and yes had many gremlins because of corrosion in the fuse box and in the ecu tray. Does it not rain in Germany?
BrickMan
@Colm89
Chain of events (for posterity):
09Nov19: I purchased the car privately with 77,299 miles completed.
30Nov19: Munich legends completed a post purchase inspection at 77,365 miles completed where a number of non-urgent suspension items were identified, but agreed that overall it was a good car.
22Feb20: car lost all power on journey out of London at approx 79,000 miles completed and was recovered to my home address.
12Mar20: car transported to Munich Legends for diagnosis and repair. Diagnosis was water damaged ecu due to blocked windscreen drains which I was advised over the phone is a common issue on e9x model, ecu replaced with genuine BMW part alongside other work identified during post purchase inspection.
21Mar20: car collected from Munich Legends, invoice of £2,394.01 paid. 79,016 miles completed.
30Mar20: car exhibits symptoms identical to those shown prior to ecu replacement. 79,135 miles completed. Breakdown cover called, no faults detected but acknowledged that car wasn’t running well (lumpy idle, loss of power, cutting out). Requested transport to Munich Legends on following Monday. Rear drivers side window regulator also fails, allowing rear window to drop and won’t close.
04May20: due to confusion with breakdown rescue company another breakdown rescue mechanic arrives instead of transport, checks codes, no faults found, car now running ok after sitting in sun all weekend. Suspect water getting into area it shouldn’t and was causing problems. I opt to attempt to drive car to Munich Legends later that week as no rain forecast.
07May20: drove car to Munich Legends with no loss of power or cutting out, but oil warning light now on. 79,172 miles completed.
12May20: call received from Munich Legends to state ecu housing damaged and letting water in, white powder like residue noticed around ecu (replaced mid-March) and wiring, not able to plug car into computer to read codes, new part ordered and should have update on faults within 24 hours. Window regulator replaced.
14May20: call received from Munich Legends, car now driving but oil light still on. Oil sensor and wiring checked and both fault free, suspect error might be related to the ecu (replaced mid-March). Munich Legends confirm ecu housing would not be inspected during ecu replacement. Suggestion from Munich Legends is for me to drive car in the hope that it dries out and fault disappears. If not the new ecu will need to go back to bmw for inspection,but if water damage is found it will not be covered by warranty and I will be liable for cost of inspection by bmw, plus cost of replacement part. Munich Legends agree to run car a few more times until I am available to collect (they haven’t) to determine if drying out clears fault. Invoice amount approximately £500.