I have a 2001 BMW 740I that would start and sometimes it wouldn’t. I had the original ECU and another one that was put in the car in 2021 by the BMW dealer to fix an Engine Fail Program issue. The problem reappeared this year so I sent both ECUs to ECU Pro. I was pleased with the way they approached the issue of the Ecu units I sent to get tested. They were able to find which one was working, I was emailed a video that showed the test and results. When I received the unit back I installed it back on the car and it has been 300 miles and the car has been running great in fact I noticed the consumption of fuel is better. I would definitely used their services again, not only did I save a lot of money and heartache. The car runs perfectly and the staff at ECU Pro is attentive, on schedule and professional