Question 1

What does P0421 mean?

Accepted Answer

Diagnostic trouble code P0421 indicates a fault in the Vehicle Speed and Idle Control system. This code is detected by the vehicle's onboard diagnostic system and requires professional diagnosis.

Question 2

What causes P0421?

Accepted Answer

Faulty sensor or wiring, Software or calibration issue, Mechanical component failure

كود P0421 — Vehicle Speed and Idle Control

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