Possible causes

– EGR Temperature Sensor harness is open or shorted
– EGR Temperature Sensor circuit poor electrical connection
– Faulty EGR Temperature Sensor
– Malfunction of EGR function, EGRC-BPT valve or EGRC-solenoid valve

Symptoms

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

P1401 Description

The Exhaust Gas Recirculation (EGR) temperature sensor detects temperature changes in the EGR passage way. When the EGR valve opens, hot exhaust gases flow, and the temperature in the passage way changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the Engine Control Module (ECM). This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases.
This sensor is not used to control the engine system. It is used only for the on board diagnosis.

P1401 Information for specific makes

P1401 FORD
P1401 HYUNDAI
P1401 LEXUS
P1401 TOYOTA
P1401 INFINITI
P1401 NISSAN
P1401 KIA
P1401 MAZDA
P1401 SUBARU
P1401 2001 FORD FOCUS
P1401 LINCOLN
P1401 MERCURY