Scent Test - If you can smell burned components, the ECU is likely weakened. If you have performed the above mentioned checks or When you are Not sure if your ECU is faulty, we can offer a comprehensive ECU check. Vehicles for example BMW 3 series E90 E91 ,E92 and https://finnvfouw.blogrelation.com/32612604/the-single-best-strategy-to-use-for-bmw-control-unit-repair