Procedure
- Understand the fault: AVCS advances the cams with oil pressure. Tiny screen filters in the banjo bolts feeding each AVCS line clog with age and starve the system - the ECU sees cams lagging targets and throws P0011/P0021.
- Locate the banjo bolts on the AVCS oil feed lines at the front of each head - your year's FSM diagram matters; placement moved across EJ generations.
- Crack each banjo bolt with a line wrench, catch the drips, and withdraw the bolt with its two crush washers.
- Find the mesh screen inside the bolt. If it's packed with sludge, you've found your code. Clean with brake cleaner and compressed air until light passes through - or delete the screen entirely, a common and accepted fix on cars with regular oil changes.
- Refit each bolt with NEW crush washers - reused washers weep oil onto hot exhaust.
- Torque to the FSM value - banjo bolts are hollow and snap if you guess heavy.
- Clear codes, change the oil and filter (the sludge came from somewhere), and drive. If the code returns with clean filters, then test the oil control valves and sensors.
Work at your own risk. Torque values and procedures vary by vehicle — always confirm against the factory service manual for your exact model.