The crankshaft position sensor transmits the crankshaft's position to the computer. This helps the computer to calculate proper spark and fuel control. If you're struggling with CELs, hard starts or no starts, stalling, and/or a rough idle, you may need to replace the crank position sensor.
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Few things are more annoying on an E90 than intermittent trunk electrics, and the usual cause is fatigued wiring where the harness bends into the trunk lid.
