Camshaft Position Sensor A Circuit (Bank 1 or Single Sensor)
Common Symptoms
- Check Engine Light illuminated
- Engine cranks but will not start
- Rough idle or engine stalling
- Poor fuel economy
- Engine hesitation or lack of power during acceleration
- Hard starting especially when engine is cold
Most Likely Root Causes
- Faulty camshaft position sensor
- Damaged or corroded wiring harness or connector at sensor
- Timing belt or chain jumped or worn causing sensor signal loss
- Failed engine control module
- Reluctor ring or tone wheel damage
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Component Location
The camshaft position sensor is typically mounted on the cylinder head near the camshaft or in the timing cover area on Bank 1.
Manufacturer Notes
Some manufacturers use magnetic Hall Effect sensors while others use optical sensors which require different diagnostic approaches.
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