P244D Lexus Exhaust Temperature Too High For Particulate Filter Regeneration Bank 1

Possible causes

– Check coolant level
– Check fuel quality
– Faulty Upstream Exhaust Temperature
– Upstream Exhaust Temperature harness is open or shorted
– Upstream Exhaust Temperature circuit poor electrical connection
– Inspect tailpipes for abnormal sediment; for example black soot, white ash, oil, coolant, or fuel
– Inspect vehicle for coolant, oil and fuel leaks

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P244d Description

The sensor is located at the catalytic converter. The temperature sensor informs the ECM as to the temperature of the exhaust gases after they have passed through the turbo, upstream of the catalytic converter.

The sensor is a NTC type resistor, which measures the temperature of the exhaust gases. The resistance, and so the voltage drop at the sensor will alter depending on exhaust gas temperature.