Error code

OBD2 P0073

OBD2P0073
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Ambient Air Temperature Sensor Circuit High.

Severity

moderateCan drive, but may experience climate control issues.

Summary

P0073 indicates an issue with the ambient air temperature sensor circuit, specifically that it is receiving high input signals. This sensor is typically located outside the vehicle near the front.

Symptoms

  • Climate control system malfunctions
  • Failure of 'Auto' mode in climate control
  • Inconsistent heating or cooling

Common Causes

  • Wiring short to positive
  • Defective ambient air temperature sensor
  • Corrosion or damage to connector and wiring harness

Diagnosis

  1. Inspect the AAT sensor for resistance readings and corrosion
  2. Check the wire harness for damage and ensure proper connection of the connector
  3. Verify reference voltage and signal voltage with key on

Fixes

  • Replace faulty ambient air temperature sensor or repair wiring issues

FAQ

What does P0073 mean?

P0073 indicates a high input signal issue with the ambient air temperature sensor circuit.

How do I fix P0073?

Inspect and replace the faulty ambient air temperature sensor or repair any damaged wiring.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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