This is a wonderful service. I have over 20 years professionally fixing cars and ECU issues can often be difficult to confirm. With this particular GL550 the ECU testing was inconclusive but with the test ecu that can be returned is a great option. I was correct and the car is now FIXED! I would highly recomend reaching out to THE ECU PRO if you have any questions. Their ECU was also more than hlaf the cost the MB dealer wanted for the unit NOT programmed or installed.
8 months ago
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