Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car that checks for ammonia in the exhaust. It's like a heater that helps the sensor work, but it's not working right now.
The P24E6 code indicates that the onboard diagnostics have detected an issue with the ammonia (NH3) sensor heater circuit. This circuit is responsible for heating the sensor to ensure it works properly.
The NH3 sensor is used in vehicles with selective catalytic reduction (SCR) systems to monitor ammonia levels in the exhaust. The heater circuit helps the sensor reach the optimal temperature for accurate readings. If the circuit is open or malfunctioning, the sensor may not work correctly, leading to this error code.
• Check Engine Light illuminated
• Potential decrease in fuel efficiency
• Possible increase in emissions
• Faulty NH3 sensor heater
• Open or shorted wiring in the heater circuit
• Blown fuse related to the heater circuit
NH3: Ammonia, a compound used in SCR systems to reduce emissions.
SCR: Selective Catalytic Reduction, a system used to reduce nitrogen oxide emissions in diesel engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the NH3 sensor and its wiring for damage.
• Check the fuse related to the sensor heater circuit.
• Replace the NH3 sensor if faulty.
• Repair or replace damaged wiring.
• Replace any blown fuses.
• OBD-II scanner
• Multimeter
• Basic hand tools (screwdrivers, pliers)
$150 - $400
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regular maintenance checks
• Ensure proper exhaust system operation
• Avoid using poor quality fuel
Sensor Issue
• Have the vehicle diagnosed by a professional.
• Avoid ignoring the Check Engine Light.
• Regularly maintain the vehicle's exhaust system.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more prevalent with the increased use of SCR systems in diesel engines.
Moderate – While the vehicle may still operate, emissions and fuel efficiency could be affected.
Driving with increased emissions may violate environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
The NH3 sensor is typically located in the exhaust system near the SCR catalyst.
Q: Can I drive with a P24E6 code?
A: It's possible to drive, but it's best to fix the issue soon to avoid increased emissions and potential damage.
Q: Will this code affect my vehicle's performance?
A: It may not significantly affect performance, but it can lead to higher emissions and reduced fuel efficiency.
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Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.