P20AF

Reductant Metering Unit Temperature Sensor Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–89 (est.)

Symptoms

Check Engine light comes on
Possible reduction in engine power
Increased fuel consumption
Increased NOx emissions
SCR error message on instrument panel

Causes

Malfunction of the injection unit temperature sensor
Open or short circuit in the sensor circuit
Poor contact in wiring connectors
Sensor contact corrosion
Engine ECU malfunction

How to Fix

Check the condition of the temperature sensor and its connection
Check the integrity of the wiring and contacts in the circuit
Measure the sensor resistance and compare with standards
If necessary, replace the temperature sensor
Check and update ECU software if necessary

Related codes

P20A0 P20B9 P20EE