◆OBD Codes

P0073

Ambient Air Temperature Sensor Circuit High

Lowsensor

Overview

The P0073 diagnostic trouble code means the PCM has identified a ambient air temperature sensor circuit high problem. This code indicates that a sensor or its circuit is not providing expected readings to the engine management system. Faulty sensor data can cause the PCM to make incorrect adjustments, affecting engine performance.

Symptoms

  • Check Engine Light (MIL) illuminated
  • Erratic engine behavior
  • Intermittent stalling
  • Poor fuel economy

Common Causes

  • Faulty PCM (Powertrain Control Module)
  • Faulty sensor (out of range or failed)
  • Corroded or damaged sensor connector
  • Sensor contamination or buildup

Diagnosis Steps

  1. 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
  2. 2Locate the specific sensor referenced by the code
  3. 3Inspect the sensor connector for corrosion, damage, or loose pins
  4. 4Test the sensor output using a multimeter or scan tool live data
  5. 5Check the wiring between the sensor and the PCM for opens or shorts

Estimated Repair Cost

$75 — $350

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Kia ForteSubaru ImprezaFord FocusToyota Corolla

Related Codes

P0340P0120P0100

More Sensor Codes

P0070Ambient Air Temperature Sensor Circuit
Low
P0071Ambient Air Temperature Sensor Range/Performance
Low
P0072Ambient Air Temperature Sensor Circuit Low
Low
P0074Ambient Air Temperature Sensor Circuit Intermittent
Low
P0095Intake Air Temperature Sensor 2 Circuit
Low
P0096Intake Air Temperature Sensor 2 Circuit Range/Performance
Low

Frequently Asked Questions

Most automotive sensors last 80,000-150,000 miles, though this varies by sensor type and driving conditions. Oxygen sensors and temperature sensors tend to degrade gradually over time.