I have a 2002 Mitsubishi Diamante LS. Recently the "Service Engine Soon" light has come on and off several times and is now on all the time. AutoZone read the codes for me and told me that I have an oxygen sensor problem. I have 2 questions:
(1) Is there any way that a bad muffler can cause this code? I have a hole in the muffler that has gotten progressively worse about the same time that the light started flashing... it doesn't seem logical to me that the muffler can cause it... but that's why I am asking.
(2) assuming it is an oxygen sensor and not the muffler, how do I know which sensor is giving me the problem? Apparently there are 4 in this car... 2 in the manifold and 2 after the catalytic converter.
Thanks so much for any help you can offer!