Question about 1997 Ford F150 Regular Cab

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1997 ford f150 just had egr valve replaced.. engine is hesitant and check engine light is on with error code 401.. whats the prob?

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  • Joe Herrera May 11, 2010

    error code 401???



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Everyone says to test out your DPFE sensor. This controls the flow of the egr. When the codes pull up, everyone thinks its the egr, but really its this little guy.
Take it by a shop and see if they can mess with the bugger. They usually run about $50+.

Posted on Feb 04, 2010

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Its usually not the dpfe on a f150 or crown vics or expeditions more than likely ur ports are stopped up in the throttle body take the vaccum line off the egr valve pull a vaccum on it if the engine doesnt change idle thats what itll be remove throttle body flip it upside down ull find two small ports filled with carbon

Posted on Apr 13, 2010


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1 Answer

Engine light comes on has a little hesitation then fine

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Check engine light p-401 what is this

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Insufficient air flow The EGR valve has been changed twice, but the engine light (401 code, EGR) stills come on what else could this be?

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The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

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It is very possiable that you may be getting a false code that will reocure till egr problems are repaired. The ecu may be trying to compensate for egr problems causing it to send the 607 code

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check inside the egr port on the intake for carbon build up.if so clean it out with a piece clothes wire.then vacuum up debri with shop vac.

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1 Answer

Code 401 comes on when checking codes

This is an airflow problem. Usually thought to be a EGR valve problem but the problem is the sensor not the valve. With OBD 2 you should have a DPFE sensor. (Delta Pressure Feedback EGR) that is a silver box with 2 hoses coming off the bottom that connect to the egr tube. That is the problem. Replace the sensor and your P0401 (that is the correct way to write the code as the P stands for Powertrain) will go away. The new updated DPFE sensor will be plastic and will probably require an updated connector. The connector should come with the updated sensor. And please use Ford Sensors.
Thank you for using FixYa - a FiXyA rating is appreciated!!

Jan 21, 2009 | 1997 Ford F150 Regular Cab

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