Basic checks
Veepeak OBDCheck BLE
A Bluetooth LE adapter for reading standard engine codes and supported live data.
View on AmazonP24E6
NH3 Sensor Heater Circuit/Open
Moderate severity
The heater inside the ammonia (NH3) slip sensor warms the sensing cell to operating temperature so it can read tailpipe ammonia. The ECM detects an open in the heater control circuit — no current flows when the heater should be active, so the sensor never reaches its working point and SCR closed-loop control is suspended.
The heater inside the ammonia (NH3) slip sensor warms the sensing cell to operating temperature so it can read tailpipe ammonia. The ECM detects an open in the heater control circuit — no current flows when the heater should be active, so the sensor never reaches its working point and SCR closed-loop control is suspended.
Common causes
- high
Burnt-out heater winding inside the sensor
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-1050
- medium
Broken wire or unplugged connector
A plausible cause — test and verify before replacing parts.
Typical part cost: $220-1050
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P24E6.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P24E6.
Unlock diagnosisFree forever · No credit card
Tools you may need
Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.
Regular diagnostics
vgate iCar Pro BLE 4.0
A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.
View on AmazonAnother option
OBDLink CX
A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.
View on AmazonIllustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.
As an Amazon Associate, Wrenchify earns from qualifying purchases. This supports the app at no extra cost to you.
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P24E6.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P24E6 mean?
P24E6 means "NH3 Sensor Heater Circuit/Open". It is a generic OBD-II code that points to a fault in the evaporative / emission control system.
What are the most common causes of P24E6?
burnt-out heater winding inside the sensor; broken wire or unplugged connector; failed heater driver stage in the dosing module — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P24E6 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.