P0545
Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)
Moderatesensor
Overview
The P0545 diagnostic trouble code means the PCM has identified a exhaust gas temperature sensor circuit (bank 1 sensor 1) 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
- Erratic gauge readings on dashboard
- ABS or traction control warning light on
- Speedometer reading incorrectly
- Incorrect sensor data shown on scan tool
Common Causes
- Open or shorted sensor wiring
- Water intrusion in sensor connector
- Incorrect sensor installed
- Sensor out of calibration
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Locate the specific sensor referenced by the code
- 3Inspect the sensor connector for corrosion, damage, or loose pins
- 4Test the sensor output using a multimeter or scan tool live data
- 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
Honda CivicNissan SentraSubaru ImprezaToyota Corolla
Related Codes
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LowP0071Ambient Air Temperature Sensor Range/Performance
LowP0072Ambient Air Temperature Sensor Circuit Low
LowP0073Ambient Air Temperature Sensor Circuit High
LowP0074Ambient Air Temperature Sensor Circuit Intermittent
LowP0095Intake Air Temperature Sensor 2 Circuit
LowFrequently 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.