Watching a Hall-effect sensor's signal line while a ferrous object is passed across its tip, with the sensor unplugged from the engine but still connected electrically. It proves the sensor switches without cranking, and separates sensor failure from air gap and reluctor wheel problems.
2010 MINI Cooper S (R56, N14 1.6L Turbo)
P0335
How to test an R56 MINI Cooper crankshaft position sensor with an oscilloscope - supply, ground, Hall switching and signal amplitude - before selling a sensor.
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Initial diagnostic: $150 for one primary concern. Additional concerns or complex diagnostic work may require additional time and charges. Standard labor rate: $150 per hour.
Florida MV Registration #MV114761