P1421 — Port Air Circuit Malfunction/ (AIR) System Bank 2

What it means

P1421 is an OBD-II diagnostic trouble code: Port Air Circuit Malfunction/ (AIR) System Bank 2.

Typical fix

Confirm the code with an OBD-II scanner, then inspect the component or circuit named above. Consult a vehicle-specific service manual for the full diagnostic and repair procedure.