A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
1. Check the non-return valve in the bearing bridge for wear.
2. Check the chain tensioner.
3. Check camshaft surfaces for damage.
Procedure
^ If the screen and check valve are not damaged:
a. Replace the camshaft bridge.
b. Erase the DTC.
^ If the screen or check valve are damaged:
a. Inspect bearing surfaces of camshafts for scoring marks.
b. Replace any camshaft or cylinder head that has camshaft bearing damage.