I have a 00 mercury sable with a check engine light on.The scanner says exhaust gas recirculation valve. So I disconnect the negative battery cable and replace the EGR valve. Later the light came back
on. The same code popped up the
same code PO401 exhaust gas
recirculation valve but I just changed
the EGR valve.What now.
EGR passage clogged - Faulty EGR Vacuum Modulator Valve - Faulty EGR Valve - Faulty EGR solenoid valve - EGR solenoid valve harness is open or shorted - EGR solenoid valve circuit poor electrical connection - Dead (Weak) battery - Faulty EGR temperature sensor and circuit - Exhaust gas leaks Read more: http://engine-codes.com/p0401_ford.html#ixzz3GHLvgH5m EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages. If the tubes are clean you may have to replaced the EGR Pressure sensor to fix the problem.
I.have same problem but the code said gas module. But went off today on own what should I do
Never heard of a gas module on a Ford product. Could it have been the fuel pump driver module? Codes P1233 and or P1234
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