P2263 is a generic OBD-II code that means:

👉 “Turbocharger / Supercharger Boost System Performance”

P0726 is a manufacturer-specific transmission-related fault in this Audi 0B5 / DL501 context. In Audi’s bulletin trail for the 7-speed 0B5 S tronic, P0726 appears as “Engine RPM signal implausible” and is grouped directly with other known mechatronic fault-cluster codes such as P1740, P174B, P174F, P179C, P179D, and P17D8.

P179D is a manufacturer-specific transmission code, not a generic engine OBD-II code. In Audi technical material for the 0B5 / DL501 7-speed S tronic, it is described as “Coolant oil valve electrical fault”, and Audi’s bulletin ties the matching case to symptom code 8030. Audi also says the fault code and symptom code must match exactly before following that repair path.

P179C is a manufacturer-specific transmission code, not a universal generic OBD-II engine code. In Audi documentation for the 0B5 / DL501 7-speed S tronic, it is described as “Main pressure valve, electric fault”, and Audi’s bulletin ties the matching case to symptom code 8029.

P174F is a manufacturer-specific transmission fault code, commonly found on:

• Audi
• Volkswagen
• DSG / S tronic gearboxes

P174B is a manufacturer-specific transmission code, not a generic engine OBD-II code. In Audi documentation for the 0B5 / DL501 7-speed S tronic, it is listed as “Valve 4 in the sub-gearbox 1, electric fault”, commonly with symptom code 8027. Audi TSBs group it with other 0B5 mechatronic faults such as P174F, P179C, P17D8, and P1740.

P1740 is a manufacturer-specific transmission code, most commonly found in:

• Audi
• Volkswagen
• DSG / S tronic gearboxes

P17D8 is a manufacturer-specific transmission code, not a universal generic OBD-II code. In Audi service literature for the 7-speed S tronic / DSG 0B5 transmission, it is described as “Torque limitation because of clutch temperature”, commonly with symptom code 8040. Audi bulletins tie this code to the message “Gearbox malfunction: you can continue driving.”

P0238 is the generic OBD-II definition for Turbocharger / Supercharger Boost Sensor “A” Circuit High. Ford code references use that wording, and Ross-Tech describes it as a manifold pressure / boost sensor signal too high fault.

P0237 is the generic OBD-II definition for Turbocharger / Supercharger Boost Sensor “A” Circuit Low. Ford’s official code lists use that wording, and it as a manifold pressure / boost sensor signal too low fault.