AutoCodes – Infiniti – P1401 Infiniti

P1401 Infiniti Code - EGR Temperature Sensor

Quick Answer

The Exhaust Gas Recirculation (EGR) temperature sensor detects temperature changes in the EGR passage way. Common causes include Faulty EGR Temperature Sensor, EGR Temperature Sensor harness is open or shorted, EGR Temperature Sensor circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1401 Infiniti indicates EGR Temperature Sensor.
Common causes: Common causes include Faulty EGR Temperature Sensor, EGR Temperature Sensor harness is open or shorted, EGR Temperature Sensor circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 5,463

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1401 Infiniti 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.

OBDII Code P1401 Infiniti - EGR Temperature Sensor - AutoCodes.com — P1401 Infiniti Code - EGR Temperature Sensor

What does this mean?

What are the Possible Causes of the DTC P1401 Infiniti?

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

How to Fix the DTC P1401 Infiniti?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1401 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.