Re: 1993 ford taurus

"janka" wrote:            (1993 Ford Taurus 6 cyl 3.0L GL.)

Here in Ontario my car failed its emissions test due to a
high NOx level.     I’ve changed the EGR valve.     Does
anyone have some tips for fixing a NOx problem?   Which
sensors might need changing/any other probable causes?
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Hi NOx indicates air/fuel mixture too lean.     The EGR
valve richens the mixture, so the new valve may solve
the problem.    The most likely other source of excess
air is a vacuum leak.    Sometimes a defective oxygen
sensor will fail to trigger the EGR valve.

Good luck.

Rodan.