B Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

Check these first

• Stuck or sluggish exhaust VVT oil control valve
• Gummed-up exhaust camshaft phaser
• Low or dirty engine oil
• Timing chain stretch

What to do next

1. Verify oil level, condition, and pressure
2. Compare commanded and actual exhaust camshaft position
3. Clean or replace the oil control valve
4. Inspect the exhaust phaser and timing chain
5. Replace worn phaser or chain components as identified

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