What does code P1421 mean on Volkswagen vehicles?
The ECU detects a short to ground in the secondary air injection valve circuit.
OBD-II Code Volkswagen
P1421 — Volkswagen — Secondary Air Injection Valve Circuit Short to Ground
The ECU detects a short to ground in the secondary air injection valve circuit.
Common symptoms
- Emissions failure
- SAI inoperative
Possible causes
- Faulty SAI valve
- wiring short to ground
Initial recommendation
Inspect secondary air injection valve and repair wiring.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
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