Skip to content
Book on WhatsApp

P0070

Ambient Air Temperature Sensor Circuit A

Generic electrical fault in the ambient air temperature sensor A circuit. Used by the ECU for cold-start corrections, climate logic, and intake-air calculations.

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

Common causes

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

  • Sensor element failedCommon
  • Wiring open or connector loosePossible

Parts involved

  • Ambient Air Temp Sensor
  • Sensor Wiring

P0070 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.