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you'll need to have a scan tool to see engine data. with key on engine off egr temp should be 50 degrees F or more. Now check to see if there is aproblem in the harness. Disconnect the EGR temp sensor connector and jump the terminals together with key on engine off. Temp should read 318.7 F. Then you'll need to run the engine at 4000 rpm for 3 minutes and check egr temp again. should be 212 degrees F. or more. If any of these values are off significantly the sensor is bad. They are available aftermarket for 120.00 to 140.00

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