Crankshaft/Camshaft Position Correlation (Bank 1, Sensor A)

What it means

The computer compares the crankshaft and camshaft sensor signals and found their relationship outside normal limits. This may mean the timing chain or belt has stretched or jumped a tooth, which deserves prompt inspection.

Symptoms5

• Hard or long starting.
• Shaking and clear loss of power.
• Rattling from the timing chain area, especially at start-up.
• Occasional stalling.
• Check engine light on.

Possible causes6

• Stretched or jumped timing chain.
• Worn chain tensioner or guide.
• Stuck camshaft phaser.
• Low or incorrect oil affecting variable valve timing.
• Inaccurate crankshaft or camshaft sensor signal.
• Timing chain or belt installed incorrectly after a previous repair.

How to diagnose and fix6

1. Check oil level and condition, and change it if needed.
2. Read accompanying codes, especially variable timing and sensor codes.
3. Inspect the crank and cam sensor connectors and wiring.
4. Listen for chain rattle on a cold start.
5. Have the timing marks checked or cam deviation read with an advanced scan tool.
6. Replace the complete chain kit if stretch is confirmed.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

If oil or a sensor is the cause, cost is low, but a timing chain kit usually lands in the third tier and can be more on some engines.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.

Frequently asked questions