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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
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