Fix P20E3: STEP-BY-STEP diagnostic GUIDE!

The P20E3: Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1 fault code indicates that there is an incorrect correlation between the readings of exhaust gas temperature sensor 1 and sensor 3 in Bank 1. This can result in improper exhaust gas temperature monitoring, which can affect the vehicle’s emissions control system. The issue may be caused by faulty sensors, wiring issues, or a malfunction in the exhaust temperature monitoring system.

P20E3 – Quick Overview

CodeInformation
MeaningP20E3: Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1
Is it serious?Yes, this can lead to improper monitoring of exhaust temperatures, affecting emissions control and engine performance.
Possible causes– Incorrect correlation between temperature sensors 1 and 3
– Faulty sensors
– Wiring issues
How to diagnose?– Compare readings from temperature sensors 1 and 3
– Test each temperature sensor
– Check wiring between sensors

P20E3 Meaning

The P20E3 fault code signifies that there is an inconsistency or improper correlation between the exhaust gas temperature readings from sensor 1 and sensor 3 in Bank 1. This can prevent the ECM (engine control module) from accurately controlling the exhaust gas temperature, which can negatively impact the vehicle’s emissions control system.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check for additional related codes that may help pinpoint the sensor correlation issue.OBD-II Scanner
Compare Readings from Sensors 1 and 3Use a diagnostic tool to compare the readings of exhaust gas temperature sensors 1 and 3 in Bank 1 and ensure they are within manufacturer specifications.Diagnostic Tool
Test Each Temperature SensorUse a multimeter to test the resistance of each temperature sensor to ensure both are working within the correct range.Multimeter
Inspect Sensor WiringVisually inspect the wiring between temperature sensors 1 and 3 for loose connections, corrosion, or damaged wires that could affect the readings.Flashlight, Multimeter
Repair or Replace Faulty Sensors/WiringIf a faulty sensor or wiring issue is found, repair or replace the component to restore proper correlation.Replacement Sensor, Wiring Kit
Clear the Code and Test DriveAfter making repairs, clear the code using an OBD-II scanner and test drive the vehicle to ensure the problem has been resolved.OBD-II Scanner, Vehicle Manual
Recheck for CodesAfter the test drive, rescan the vehicle to ensure the P20E3 code does not return.OBD-II Scanner
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