P0548 Fault Code

Exhaust Gas Temperature Sensor Circuit Low - Bank 2 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0548 fault code indicates an issue with the Exhaust Gas Temperature (EGT) Sensor Circuit for Bank 2 Sensor 1, which is responsible for monitoring the exhaust gas temperature in this bank of cylinders. This sensor helps optimize engine performance and emissions by ensuring that the exhaust gases are at the appropriate temperature. If the sensor is malfunctioning or the circuit is low, it can lead to engine inefficiency and increased emissions.

What are the symptoms of the P0548 code?

Drivers may notice several symptoms when the P0548 code is triggered, such as:

• Check Engine Light illuminated on the dashboard
• Decreased engine performance
• Rough idle or stalling
• Increased emissions, possibly failing an emissions test
• Poor fuel economy.

What causes the P0548 code?

Common causes of the P0548 fault code include:

• A defective Exhaust Gas Temperature Sensor
• Issues with wiring or connectors leading to the sensor
• Short circuits or open circuits in the sensor circuit
• Corroded connectors or damaged wires
• Problems with the engine control module (ECM) affecting sensor readings.

How to fix P0548?

To resolve the P0548 fault code, follow these steps:

1. Use an OBD-II scanner to confirm the code and ensure there are no other related codes present.
2. Inspect the wiring and connectors associated with the Bank 2 Sensor 1 EGT sensor for any signs of damage or corrosion.
3. Test the exhaust gas temperature sensor with a multimeter to determine if it is functioning correctly.
4. Replace the EGT sensor if it is found to be faulty.
5. Clear the fault codes from the ECU and perform a test drive to ensure that the issue is resolved.