There are a lot of sensors in the modern vehicle to help control emissions and improve the efficienty. Exhaust gas temperature is used, along with other sensors, to accurately measure the air/fuel ratio to determine how effectively an engine is running. Follow this Real Fix to see how a code P20E2 on this Ford F250 Super Duty related to the exhaust gas temperature sensor system was diagnosed and repaired.
Vehicle
2008 Ford Pickup F250 Super Duty 6.4L
Title
P20E2, Replaced Exhaust Gas Temperature Sensor
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P20E2 – Exhaust Gas Temperature Sensor 1/2 Correlation (Bank 1). Engine cold, with the key on, engine off, used the scan tool to monitor live data and found the exhaust gas temperature sensor #2 signal parameter was over 25 degrees C higher than the exhaust gas temperature sensor #1 and exhaust gas temperature sensor #3 signal parameters. Performed an inspection of the exhaust gas temperature sensor #2 wiring harness and connectors, and found there were no loose connections or signs of damage. Used a multi-meter to measure the resistance of the exhaust gas temperature sensor #2 and found the measured resistance was out of specifications. These test results verified the exhaust gas temperature sensor #2 was faulty.
Correction
Replaced the exhaust gas temperature sensor #2, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.
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