TuningBot DTC Database · v4.37.14
Manufacturer-specific interpretation for VAG. All interpretations of P1421
The control module detected a short circuit to ground in the Secondary air injection (AIR) valve/solenoid circuit. This is the manufacturer-specific definition used by Audi.
The control module detected a short circuit to ground in the Secondary Air Injection Solenoid Valve (N112) circuit. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 17829. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Diagnostic Trouble Code (2 interpretations). The control module detected a short circuit to ground in the Secondary air injection (AIR) valve/solenoid circuit. This is the manufacturer-specific definition used by Audi.
P1421 is a manufacturer-specific code. In this database it is documented for: VAG. The same number can mean something different on other brands.
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Understand the system behind this code: Secondary Air System
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