Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the sensor that measures the temperature of the exhaust gases on one side of the engine is reading too high.
The P0549 code is triggered when the Engine Control Module (ECM) detects a voltage signal from the exhaust gas temperature sensor that is higher than the expected range.
The exhaust gas temperature sensor measures the temperature of the exhaust gases leaving the engine. This information is used by the ECM to optimize engine performance and emissions. Bank 2 refers to the side of the engine opposite to cylinder 1, and Sensor 1 is the sensor located before the catalytic converter. A high circuit signal typically indicates a short to voltage or a faulty sensor.
• Check Engine Light is on
• Poor fuel economy
• Possible engine performance issues
• Faulty exhaust gas temperature sensor
• Wiring issues such as short to voltage
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
Bank 2: The side of the engine opposite to cylinder 1
• Use an OBD-II scanner to confirm the code.
• Inspect the exhaust gas temperature sensor and its wiring for damage.
• Test the sensor's voltage and resistance to ensure it is within specifications.
• Replace the exhaust gas temperature sensor if faulty.
• Repair any damaged wiring or connectors.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Digital multimeter
• Basic hand tools
$100 - $300
Moderate
• Audi A4
• Volkswagen Passat
• BMW 3 Series
• Regularly inspect and maintain exhaust system components.
• Ensure proper electrical connections and wiring integrity.
• Use high-quality fuel to prevent sensor contamination.
Sensor Issue
• Address the issue promptly to avoid potential engine damage.
• Consult a professional mechanic if unsure about the diagnosis.
• Avoid driving the vehicle for extended periods with the Check Engine Light on.
Sensor issues may be covered under the vehicle's emissions warranty. Check with the manufacturer or dealer.
P0549 is a relatively common code for vehicles with advanced emissions systems, particularly in models with turbocharged engines.
Moderate – It is advisable to address this issue soon to prevent further emissions and performance problems.
Driving with a faulty exhaust gas temperature sensor can lead to increased emissions and potential damage to the catalytic converter.
• Engine at operating temperature
• Vehicle in closed-loop operation
The exhaust gas temperature sensor is located in the exhaust manifold or exhaust pipe on the side of the engine opposite to cylinder 1 (Bank 2).
Q: Can I drive with a P0549 code?
A: While the vehicle may still be drivable, it is not recommended to ignore the issue as it can lead to increased emissions and potential damage to other components.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspections of the exhaust system and sensors can help prevent this code.
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Universal · Digital multimeter
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Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal 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.