Question

2004 Audi S4 with engine code P0021, what is the code meaning?

Answer 1

Hello, this code points to a Faulty Continuously Variable Valve Timing Solenoid. Start by checking the oil level and make sure it's clean and full, here are some other possible issues.

P0021 AUDI Code - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2
Read more: https://www.autocodes.com/p0021_audi.html