Your vehicle has two cats. Two o2 sensors before the cats and two after the cats.
You can go cat-less, motor will run... but you might not see much good out of it. The Computer will be screwed up because of the cats missing. Not to mention the OBDII system will fire off error codes.
Maybe use one of those test pipes? Then you still can use your 02
I assume that there are two before and two after to check that the
cats are working. So basicaly in a normally working system the
two O2s' before the cat should read a little lean and after the cats
they should read no O2 at all ( the cats used the extra 02 to burn the
excess fuel ).
Therefore if you take out the cats (test pipe) it will richen the mixture
because the fronts will read the same as the backs (lean). I wonder if
you do this if it will throw a code because the fronts are getting the same
signal as the back? Is there a bad cat code??
If you eliminate the cats on your 2001, you will have an eternal check engine light unless you replace the 2 downstream O2 sensors with some sort of cheater device. If seen these for other vehicles (mustangs maybe?). The O2 sensors downstream of the cats do nothing but continuously monitor cat performance. Pull the cats and they will "know" right away. It wont harm performance or the ECM as they don't manage fuel trim, but you will never get the CEL to go out. (without some rigged up electronics black-box) IMHO- okay for a truck on it's last legs. For a 2001? Nahhh.
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