Quote:
Originally Posted by Dale Bob
I already bought a new Walker 50 State rear one. The flange on the front one where they meets is pretty rusty and was hard to get a good seal last time I was there. I had to put a fiber gasket in to get rid of a leak. I also have a code for cat efficiency and I'm not sure if its the front one or the rear one that causes it. I'm concerned about where it bolts to the manifold pipe.
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Sometimes the code is not actually the cat, but the rear O2 sensor itself has gone bad. You can get them for roughly $45 on Amazon, just confirm it's the right part number (you can do it here:
Find My Part). That's if you have the P0420 code. I'd hate for you to go through all the trouble only to find out it was the sensor and not the cat.
