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P0021 Diagnostic Trouble Code Discussion for January 2012

Camshaft Position 'A' Timing Over-Advanced / System Performance (Bank 2)

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Trouble Ticket Help Requests for DTC P0021
Help Request Posted
1999 BMW 740iL 4.4L MIL Lamp on
P0021: Intake camshaft position - timing over-advanced bank 2. Hello, vehicle driven to shop, horrible rattling from timing. Removed valve covers and could see guides destroyed. When I removed lower timing cover, chain had so much slack it drooped completely off of lower sprocket. Replaced lower chain and all guides, rail...
January 10, 2012