From Ross-Tech Wiki
16396/P0012/000018 - Bank 1: Camshaft A (Intake): Advance Setpoint not Reached (Over-Retarded)
- Erratic Idle
- Intake Camshaft Adjuster tight/stuck
- Intake Camshaft Adjuster faulty
- Check Intake Camshaft Adjuster
- When the Intake Camshaft Adjuster uses oil pressure to control the adjuster, check the oil pressure. The 1.8T is notorious for issues but any engine with low oil pressure or restrictions in the system could result in various timing DTC's such as 17748/P1340/004928.
- Use Output Test, Meas. Value Blocks (MVB) & Basic Setting