failed emissions due supposedly to egr, but after replaced did not fix, ck engine lt still on, 3-4 yrs prior had same problem, sidle air control valve, this sensor, that sensor, nothing worked after $400 so I said "Forget it". Now i'm in Atlanta and have to pass emission. Still looking for the answer. Next I'm trying EGR Vacuum sensor. There seems to be no "real" diagnosis, just try this and try that just like last time. Nobody knows truly what to do.
my check engine light came on took it to advance they said the EGR valve need to be replaced how can I check to make sure that I needs to replace valve or if its a vacuum leak or plug tube and if I do need to replace it anybody have a good video on a 95 Lincoln town car egr valve replace