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P0116 is the generic OBD-II code for Engine Coolant Temperature Circuit Range/Performance. In manufacturer service information, it is used when the PCM/ECM sees an engine coolant temperature signal that does not behave the way it should, not simply when the circuit is fully open or shorted. Toyota manuals describe P0116 as a range/performance problem, and Mitsubishi service info lists the most likely causes as the ECT sensor, harness/connector damage, or the ECM.
The turbo actuator is a critical part that controls:
👉 Boost pressure
👉 Wastegate or VGT (variable geometry)
👉 Turbo response
P003A is a generic OBD-II turbo-related code that means:
👉 “Turbocharger Boost Control Position Exceeded Learning Limit”
P00AF is a generic OBD-II code for “Turbocharger/Supercharger Boost Control ‘A’ Module Performance.” Multiple manufacturer bulletins and VAG references use essentially that same definition.
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:
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.