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P00D9

Ambient Air Temperature Sensor Circuit B

Generic electrical fault on ambient air temperature sensor B (second sensor for redundancy or second measurement location).

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: easy

Common causes

Ordered by how often each turns out to be the cause.

  • Sensor failedCommon

Parts involved

  • Ambient Air Temp Sensor B
  • Sensor Wiring

P00D9 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.