Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a sensor that checks how hot the exhaust is. This code means that the sensor on the side of the engine with the second set of cylinders is reading a temperature that's too low.
The P0548 code indicates that the exhaust gas temperature sensor on bank 2, sensor 1, is reporting a temperature that is lower than expected.
The exhaust gas temperature (EGT) sensor measures the temperature of the exhaust gases leaving the engine. This information is used by the engine control module (ECM) to optimize performance and emissions. Bank 2 refers to the side of the engine with the second cylinder head, and sensor 1 is located before the catalytic converter. A 'circuit low' condition means the sensor is reporting a lower voltage than expected, which could indicate a faulty sensor, wiring issues, or a problem with the ECM.
• Check Engine Light is on
• Poor engine performance
• Increased emissions
• Faulty exhaust gas temperature sensor
• Wiring issues such as short to ground or open circuit
• Faulty engine control module (ECM)
Bank 2: The side of the engine with the second cylinder head.
Sensor 1: The sensor located before the catalytic converter.
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the exhaust gas temperature sensor with a multimeter.
• Replace the exhaust gas temperature sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Tundra
• Regularly inspect and maintain the exhaust system.
• Ensure all sensors are clean and free from damage.
• Perform routine diagnostics to catch issues early.
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle checked by a professional if unsure.
• Regular maintenance can prevent such issues.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been commonly reported in vehicles with high mileage or those that frequently tow heavy loads.
Moderate – While the vehicle may still be drivable, it is important to address this issue to ensure optimal performance and emissions.
Driving with a faulty exhaust sensor can lead to increased emissions, which may not comply with environmental regulations.
• Engine at operating temperature
• Vehicle running at idle
The exhaust gas temperature sensor is located on the exhaust manifold or pipe of bank 2, before the catalytic converter.
Q: Can I drive with a P0548 code?
A: While you may be able to drive, it's best to fix the issue soon to avoid potential engine performance problems.
Q: How can I reset the Check Engine Light?
A: After repairs, you can use an OBD-II scanner to clear the code and reset the light.
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Universal · Digital multimeter
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.