Question about 1997 Ford Taurus
P171 and 174 is running lean that means you have either no fuel pressure, bad fuel pump, cloged fuel filter and somethimes vacum leak on your intake manifold gasket.
443 indicates EGR valve solenoid malfunction.
Posted on Dec 31, 2009
Po171 and po174 codes mean system lean bank one and two. Ford Taurus's have issues with intake gaskets leaking when its cold then as the car warms up they swell up and seal causing the car to run better. Also they have an issue with the elbow that connects the pcv valve to the intake getting weak and collapsing the finally busting causing a bad vacuum leak. I would check these two issues first. You can test the intake leak with a can of carb or throttle body cleaner. Start the car and while its running bad spray the cleaner around the where the intake bolts to the engine and other vacuum if the problem is found you will notice a change in how the engine runs or it may stall if it goes back running bad hit that area again with the cleaner if it changes the engine there is your problem.
Posted on Jul 02, 2012
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