P0A03

Symptoms

• Unstable engine operation at idle
• Increased fuel consumption
• Incorrect temperature readings on the dashboard
• Turning on the cooling fan on a cold engine
• Check Engine Light Illuminates

Causes

• Broken or damaged sensor wiring
• Malfunction of the temperature sensor itself
• Poor contact in the sensor connector
• Short circuit in the sensor circuit to ground
• Problems with the engine ECU

How to Fix

1. Check the integrity of the wiring and connectors of the sensor
2. Measure sensor resistance at different temperatures
3. Check the voltage and reference voltage in the circuit
4. Replace temperature sensor if necessary
5. Flash or replace the ECU if a malfunction is detected

Related codes

Error P0A03 by Vehicle Brand