hi all tech . i have this one here it drive me nut, car failed for high nox at both 15&25 mph. have egr sys. checked egr sys. all show fine accept vaccum was not steady to egr, it fluctuate between 0 to 6 inch of [...] pressure in spec 40 psi at idle. o2 switc...

FIX posted 11/27/2006

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