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
Code | Information |
---|---|
Meaning | P20E3: 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
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use 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 3 | Use 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 Sensor | Use a multimeter to test the resistance of each temperature sensor to ensure both are working within the correct range. | Multimeter |
Inspect Sensor Wiring | Visually 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/Wiring | If 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 Drive | After 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 Codes | After the test drive, rescan the vehicle to ensure the P20E3 code does not return. | OBD-II Scanner |

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