* Which sensor are you asking about? The CKP or the CMP? They have different locations and functions.
* What is the problem? Knowing the symptom (e.g., no start, rough running, check engine light) helps diagnose the issue. A bad sensor will often trigger a diagnostic trouble code (DTC). Getting the DTC code is crucial.
* Do you want to know the location? The CKP is typically on the engine block near the crankshaft, while the CMP is usually on the distributor (if equipped) or on the top of the engine near the camshaft. Precise location varies slightly by year and specific engine configuration.
To help me help you, please provide more information. A picture might even be helpful!