Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means the car's computer thinks the temperature sensors in the exhaust system aren't agreeing with each other. It's like two thermometers showing different temperatures when they should be the same.
The vehicle's computer monitors the temperature of the catalytic converter using sensors. If it detects a discrepancy between the readings of two sensors on the second bank of the engine, it triggers this code.
P046B is triggered when the Engine Control Module (ECM) detects a correlation issue between the readings of the two temperature sensors located before and after the catalytic converter on Bank 2. This discrepancy indicates that the sensors are not providing consistent data, which could affect the efficiency of the catalytic converter.
• Check Engine Light illuminated
• Possible decrease in engine performance
• Increased emissions
• Faulty catalyst temperature sensor
• Wiring issues or poor connections in the sensor circuit
• Faulty catalytic converter
Catalytic Converter: A device in the exhaust system that reduces harmful emissions.
Bank 2: Refers to the side of the engine opposite Bank 1, usually on V-type engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the catalyst temperature sensors for proper operation.
• Replace the faulty catalyst temperature sensor.
• Repair or replace damaged wiring or connectors.
• Replace the catalytic converter if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Toyota Camry
• Ford F-150
• Chevrolet Silverado
• Regular maintenance and inspection of the exhaust system.
• Timely replacement of faulty sensors.
• Use quality fuel to prevent catalyst damage.
Sensor Issue
• Avoid driving for long periods with this code active.
• Get the vehicle inspected by a professional mechanic.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with sensor issues in vehicles with high mileage or those that have been exposed to harsh conditions.
Moderate – It should be addressed soon to prevent potential damage to the catalytic converter.
Driving with a faulty catalytic converter can lead to increased emissions, which may not comply with local environmental regulations.
• Engine at operating temperature
• Exhaust system free of leaks
The catalyst temperature sensors are located in the exhaust system, one before and one after the catalytic converter on Bank 2.
Q: Can I drive with a P046B code?
A: While you can drive with this code, it's best to get it fixed soon to avoid potential damage to the catalytic converter.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to reduced fuel efficiency, increased emissions, and potential damage to the catalytic converter.
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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.
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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.