Question about 2001 Ford Taurus
Was getting fault code P0420, so I replaced all four O2 sensors with Bosch models. Also replaced plugs (Motorcraft platinum) and plug wires (Motorcraft). Car seems to run fine on road, but initial start up idle is high (12-1300 RPM) and at idle during stops occasional misses are felt (seems like a slight lurch). Fault codes P0171 and P0174, indicating lean mixture on banks one and two, came up after stopping. Car has 98,000 miles on it.
The P0420 code is a Catalytic converter efficiency code check the compression.Swap the #1 injector to a different location to see if the code follows.Test the coilpak. A cracked exhaust manifold is the most likely cause p0171 and 0174 Induction air leaks, vacuum or some kind fuel restriction, weak fuel pump, restricted fuel filter etc.You also could have an exhaust leak near the upstream o2 sensor. If youtake it in they will probably use smoke to find out where the leak is.
Posted on Apr 22, 2009
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Posted on Jan 02, 2017
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