P24E7

NH3 Sensor Heater Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Increased emissions of harmful substances
Reduced efficiency of the SCR system
Possible problems starting the engine in cold weather

Causes

NH3 sensor malfunction
Open or short circuit in the heater circuit
Fuse or relay problems
Engine control unit (ECU) malfunction

How to Fix

Check the continuity of the NH3 sensor heater circuit
Check fuses and relays associated with the heater circuit
Test the NH3 sensor for malfunctions
If necessary, replace the NH3 sensor
Check and, if necessary, reflash the engine control unit

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