What you’ll see in this one
It's worth separating a voltage problem from a bad starter or sensor. This is the 335i engine-ground job, not a universal fix for BMW starting trouble.
BMW · Electrical & Diagnosis
I'm replacing an engine ground connection on a BMW 335i while investigating a no-crank or no-start complaint. A bad ground can make a starting problem look bigger than it is, so this video looks at one of the electrical connections worth inspecting before throwing parts at the car.
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It's worth separating a voltage problem from a bad starter or sensor. This is the 335i engine-ground job, not a universal fix for BMW starting trouble.
This BMW 335i video is about the engine-to-chassis ground connection in the context of starting and electrical symptoms. Searches for E90 ground strap corrosion, poor ground and starter-voltage-drop testing can all lead to this subject. A no-crank condition may have many causes, and continuity alone is not the same as testing a connection under load. Watch to locate the area and see this repair, then verify your electrical diagnosis against the vehicle's wiring and service information before replacement.