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 not working right. This sensor helps the car know how hot the exhaust is.
The P242A code is triggered when the Engine Control Module (ECM) detects a problem with the exhaust gas temperature sensor circuit on bank 1, sensor 3.
The exhaust gas temperature sensor is used to monitor the temperature of the exhaust gases leaving the engine. This information is vital for the ECM to control emissions and ensure optimal performance. Bank 1 refers to the side of the engine with cylinder 1, and sensor 3 is typically located further down the exhaust system, possibly after the catalytic converter.
• Check Engine Light illuminated
• Poor fuel economy
• Engine performance issues
• Increased emissions
• Faulty exhaust gas temperature sensor
• Wiring issues such as shorts or open circuits
• Corroded or damaged connectors
• ECM software issues
ECM: Engine Control Module, the computer that controls engine functions.
OBD-II: On-Board Diagnostics, a standardized system for vehicle self-diagnosis and reporting.
• Use an OBD-II scanner to verify the code and check for other related codes.
• Inspect the exhaust gas temperature sensor and its wiring for damage or corrosion.
• Test the sensor with a multimeter to ensure it's functioning properly.
• Check the ECM for any software updates or faults.
• Replace the faulty exhaust gas temperature sensor.
• Repair or replace damaged wiring or connectors.
• Clear the code and test drive to ensure the issue is resolved.
• Update the ECM software if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance and inspection of the exhaust system.
• Ensure proper installation of sensors.
• Use quality fuel to prevent excessive soot buildup.
Sensor Issue
• Drive gently until the issue is resolved to prevent further damage.
• Schedule a repair as soon as possible to avoid increased emissions.
Check with your vehicle manufacturer as emissions-related components may be covered under warranty.
Exhaust gas temperature sensor issues have become more common as emission standards have tightened, requiring more precise monitoring of exhaust gases.
Moderate – It is advisable to address this issue soon to prevent potential damage to the catalytic converter and to ensure emissions compliance.
Ignoring this code may lead to increased emissions, which could be illegal in regions with strict emissions regulations.
• Engine at operating temperature
• Vehicle in a safe, controlled environment
The exhaust gas temperature sensor is typically located in the exhaust system, often near or after the catalytic converter on the side of the engine with cylinder 1.
Q: Can I drive with a P242A code?
A: While you can drive with this code, it's best to get it fixed soon to avoid potential damage and increased emissions.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code after the repair, or the light may turn off automatically after several drive cycles.
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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.