in the engine
Please specify what engine 4.8
Under the dog house
On the 2004 Chevy Express with a 4.3L engine, the crankshaft position sensor is located at the rear of the engine, near the transmission bellhousing. It is typically mounted on the engine block and can be accessed from underneath the vehicle. To replace or inspect the sensor, it's often necessary to remove components that may obstruct access.
The 2001 Chevy Express Van crankshaft sensor will be on the back of the engine. You will need to remove the rear engine cover in order to access the crankshaft sensor.
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Need to know which sensor, there are several.