SureTrack Real Fix: It’s a Gas

Real Fixes from ShopKey’s SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version or in our ShopKey Pro product.

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.

2008 Ford Pickup F250 Super Duty 6.4L

P20E2, Replaced Exhaust Gas Temperature Sensor

The customer states the check engine light is on.

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.

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.

SureTrack® adds to the power of ShopKey Pro with an exclusive combination of expert knowledge and detailed parts replacement records, all wrapped in an interactive community. Designed to help automotive shops increase accuracy and efficiency from diagnosis to completed repair, the industry’s most comprehensive repair information resource is just a few clicks away.

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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.