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 a part of the exhaust system is. This code means that the sensor on one side of the engine is reading a temperature that's too low.
The P0437 code indicates that the voltage signal from the catalyst temperature sensor on Bank 2, Sensor 1 is lower than the expected range.
The catalyst temperature sensor measures the temperature of the catalytic converter to ensure it is operating efficiently. The sensor sends a voltage signal to the engine control module (ECM). If the ECM detects a voltage that is too low, it triggers the P0437 code.
• Check Engine Light illuminated
• Poor engine performance
• Increased emissions
• Faulty catalyst temperature sensor
• Wiring issues such as shorts or open circuits
• Malfunctioning ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors of the temperature sensor.
• Test the catalyst temperature sensor for proper operation.
• Replace the catalyst temperature sensor.
• Repair or replace damaged wiring or connectors.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regular maintenance checks
• Inspect exhaust system periodically
• Ensure proper sensor installation
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional.
• Avoid driving for long periods if performance issues are noticed.
Check vehicle warranty for coverage on emissions-related components.
This code has been associated with issues in vehicles with aging catalytic converters or sensor failures.
Moderate – Address the issue to prevent further emissions problems.
Driving with a faulty emissions system can lead to increased pollution and may not comply with local emissions laws.
• Engine at operating temperature
• Vehicle in park or neutral
The catalyst temperature sensor is located on the exhaust manifold of Bank 2, before the catalytic converter.
Q: Can I drive with a P0437 code?
A: It's possible to drive, but it's not recommended as it can lead to increased emissions and potential engine performance issues.
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, or the light may turn off after several driving cycles if the issue is resolved.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.