P0548 Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

Definition: The OBD-II code P0548 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the exhaust gas temperature sensor located on bank 2, sensor 1. This sensor is responsible for monitoring the temperature of the exhaust gases to ensure optimal engine performance and emissions control.

p0548: Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

Severity: Moderate

Common Causes

P0548 – Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

Common causes:

• Faulty exhaust gas temperature sensor
• Wiring issues such as short circuits or open circuits
• Corrosion in the sensor connector
• Exhaust leaks near the sensor
• Issues with the engine control module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0548

Description: Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

Common Misdiagnosis: Replacing the exhaust gas temperature sensor without checking for wiring issues or poor connections.

OBD2 Code: P0549

Description: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Common Misdiagnosis: Assuming a faulty sensor when the issue may be due to short circuits or high resistance in the circuit.

OBD2 Code: P0550

Description:

Common Misdiagnosis:

OBD2 Code:

Description:: Power Steering Pressure Sensor/Switch Range/Performance Problem

: Focusing on the sensor itself rather than examining fluid levels and pump operation.

 

Common Diagnostic Steps

OBD2 Code: P0548

Description: Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect the exhaust gas temperature sensor for any visible damage or disconnection.
• Check the wiring and connectors for corrosion, damage, or loose connections.
• Measure the resistance of the exhaust gas temperature sensor using a multimeter to ensure it is within specifications.
• Test the voltage supply to the sensor circuit; ensure it’s receiving proper power and ground signals.
• If available, use a scan tool to monitor live data from the exhaust gas temperature sensor to check for abnormal readings.
• If all checks are normal, consider replacing the exhaust gas temperature sensor as it may be faulty.
• If issues persist after replacing the sensor, further diagnose potential ECM (Engine Control Module) faults or software updates needed.