does this mean I have to replace the cat that comes
off the exhaust header or the one in the rear before
the muffler.
Wednesday, October 8th, 2008 AT 9:22 AM
1 Reply
2CARPRO JACK
MECHANIC
11,533 POSTS
The one closest to teh exhaust manifold is most likely a pre-cat. If the one before the muffler has the second o2 sensor behind it, that is the main cat and it is most likely the one that needs to be replaced