This Heater Control Solenoid Valve is a direct OE replacement for Volkswagen and Audi vehicles. If your car has lost cabin heat, is displaying the P268100 (Coolant Bypass Valve Control Circuit Open) error, or has a "Check Engine" light related to the cooling system, this solenoid is likely the failed component. Solves Fault P268100: Specifically addresses the "Open Circuit" error in the coolant bypass system. Durability: High temp resistant housing to prevent cracking and leaks common in original units. OE Part Number: 4H0 121 671 B , 4H0121671D, 4H0121671G (These are often interchangeable; please verify). To Fit: Audi A4 3.0 TDI 218 quattro B9 (8W) (2015-) 01/15-08/18 A4 2.0 TDI 190 Avant B8 (8K) (2011-2017) 01/08-12/15 Q7 3.0 50TDI 4MB(2015-) 01/15-12/19 S5 3.0.
