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#1
09-26-2005, 10:23 AM
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P401/p402
I got the codes read over the weekend and it showed 401/402 EGR Excessive flow/EGR Insufficent flow. My mechanic believes that it may be the EGR Selonid/sensor, and if the EGR ports were bad, then you should get only one code.\
Any comments?? He done a pressure/vac test and all was well. 
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#2
09-26-2005, 12:03 PM
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Re: P401/p402
Since the codes seem to contradict each other I would question the DPFE. This is the device that measures and reports the EGR flow. They are known to fail. DO a search under DPFE. I have outlined a simple test or use a Haynes manual as I think the procedure is in there as well
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