P24E9

NH3 Sensor Heater Circuit Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Increased NOx emissions
Reduced efficiency of the SCR system
Possible emergency operation of the engine
Unstable engine operation

Causes

Open or short circuit in the heating circuit of the NH3 sensor
Malfunction of the NH3 sensor itself
Problems with the heating circuit relay or fuse
Wiring harness damage
Engine ECU malfunction

How to Fix

Check the integrity of the NH3 sensor heating circuit
Check fuses and relays associated with the heating circuit
Inspect the wiring harness for damage
Check the resistance of the sensor heating element
If necessary, replace the NH3 sensor

Related codes

P24EA P24EB P24EC