P0544: Exhaust Gas Temperature Sensor Circuit Malfunction (Bank 1 Sensor 1)
The P0544 code indicates a problem with the exhaust gas temperature (EGT) sensor circuit for Bank 1 Sensor 1. This sensor monitors the temperature of exhaust gases before the catalytic converter to protect the engine and emissions system from excessive heat. The Powertrain Control Module (PCM) detects a voltage signal outside the expected range, indicating an open, short, or faulty sensor. Common causes include a defective EGT sensor, damaged wiring or connector, or exhaust leaks near the sensor. Driving with this code can lead to reduced fuel economy, poor performance, and potential catalytic converter damage if ignored.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connector
- Exhaust leak near the sensor
- PCM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Poor engine performance or hesitation
- Possible limp mode activation
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0544 and check for additional codes.
Step 2: Visually inspect the EGT sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage with a multimeter; compare to manufacturer specifications.
Step 4: Check for exhaust leaks near the sensor that could affect readings.
Step 5: Replace the sensor if faulty, clear the code, and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0544, as it can cause poor performance, reduced fuel economy, and potential damage to the catalytic converter or engine from excessive heat.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY replacement of the sensor, or $100 to $300 if professionally diagnosed and repaired, including parts and labor.