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Q: Check Engine Light still on on 1997 Ford Ranger

I have had an ongoing problem. I have had the codes 171 & 174 for the last few months. I got printouts for these codes, and replaced first the MAS, then the 3 oxygen sensors. I reset the computer and still get the codes. sometimes it is only 171 after reset, other times it is both. One of my mechanic friends said I probably have a intake gasket leak. Is that the next most likely cause?
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I also have a '97 ranger with a v6 and had the same codes coming up. I did all the checks, replaced maf, redid intake gaskets and injector o-rings. NOT my trouble. My problem was a hole was rusted in the pipe going from the egr valve to the intake plenum. It was right behind the valve on the bottom side of the pipe. I had to use a small mirror to see. I found it accidentally. I repaired the pipe and all has been fine since. An intake leak can come from any area where there is suction from the intake.
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