P21A4

Mixture control, cylinder 9 – value out of range

DTC P21A4, sometimes indicated as P21A400 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the air/fuel mixture causing mixture control, cylinder 9 – value out of range.

  • P21A4: Mixture control, cylinder 9 – value out of range
  • P21A4 00: Mixture control, cylinder 9 - value out of range

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