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 a sensor in the car's exhaust system is reading higher temperatures than expected. It's like a thermometer that is showing a really high temperature when it shouldn't.
The engine control module (ECM) has detected a high voltage signal from the exhaust gas temperature sensor, indicating an unusually high temperature reading.
The P242D code is triggered when the ECM detects a voltage signal from the exhaust gas temperature sensor (EGT) that is higher than the expected range. This sensor is located on Bank 1, Sensor 3, which monitors the temperature of the exhaust gases to ensure optimal performance and emissions control.
• Check Engine Light illuminated
• Poor fuel economy
• Reduced engine performance
• Faulty exhaust gas temperature sensor
• Wiring issues such as short circuits or open circuits
• Exhaust leaks or damage
ECM: Engine Control Module
EGT: Exhaust Gas Temperature
• Use an OBD-II scanner to confirm the code.
• Inspect the exhaust gas temperature sensor and its wiring.
• Check for exhaust leaks or damage.
• Replace the faulty exhaust gas temperature sensor.
• Repair or replace damaged wiring.
• Fix any exhaust leaks or damage.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Tacoma
• Regular maintenance checks
• Ensure proper exhaust system operation
• Use high-quality fuel
Sensor Issue
• Avoid driving long distances until repaired.
• Have the vehicle inspected by a professional.
• Monitor fuel efficiency and performance.
Check with the 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 – It should be addressed soon to prevent potential damage to the exhaust system or catalytic converter.
Driving with a faulty exhaust sensor can lead to increased emissions and may not pass emissions testing.
• Engine at operating temperature
• Vehicle in closed-loop operation
The exhaust gas temperature sensor is located in the exhaust system, typically near the catalytic converter on Bank 1.
Q: Can I drive with a P242D code?
A: It's not recommended to drive for long periods with this code as it can lead to further damage.
Q: How do I reset the P242D code?
A: After repairs, use an OBD-II scanner to clear the code, or it may reset after several drive cycles if the issue is resolved.
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Universal · Digital multimeter
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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.