2003 Jeep Grand Cherokee 4.0 Liter Engine with a P1281 Code.

This automotive repair article is on a specific check engine light code for a Jeep Grand Cherokee. When scanned with an automotive scan tool, a P1281 fault code was retrieved. The code has to do with the engine not reaching operating temperature within a certain length of time after the vehicle has been started. For the catalytic converter to operate at it’s best the engine needs to reach it’s normal operating temp. The cooling system’s thermostat normally stays closed when the engine is cold, allowing the motor to warm up quickly. That’s why the trick of removing the thermostat to let the car run cooler, like back in the 1970’s (prior to on-board computers) doesn’t work well anymore.

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2000 Ford Expedition P0401 doesn’t necessarily mean the EGR is bad

Summary: Ford DPFE problems discussed. Common causes for Ford EGR low flow issues and P0401 fault code triggered. Don’t replace the EGR (Exhaust Gas Recirculation) valve just yet if you have a P0401 code on a 4.6 liter engine like the one in this Expedition. The diagnostic code definition states “Low flow from E.G.R.” Low flow doesn’t mean definitively that the EGR is bad. Low EGR flow can be a problem in any Ford, Mercury, Lincoln, Mazda and many other car’s for that matter. On a lot of Ford vehicles this code will mean there is a faulty Differential or Delta Pressure Feedback (DPFE) sensor. This was such a common problem there was an extended warranty coverage on them for awhile. Not many people knew about Ford covering these on some models for an extended period of time. At the shop I worked at, an extended warranty company first alerted us to this when they declined an extended warranty claim because Ford would replace it under warranty.

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