[JFP in PA]

Originally Posted by jb92563

I have a marginal CAT with a P0430 code and think it may have gotten plugged up after my AOS failure a 1000 miles ago.

I just ignored the Engine light hoping it would eventually improve after using some Techtron additive but it has been staying on more than off.

I have a smog due in Nov so its time for action.

I plan to run some "CRC Guaranteed To Pass Emissions Test Formula" and replace the rear O2 Sensors, plus use some MAF cleaner.

Does anyone know the Brand Model number I should use for the post Cat Sensors, and a good source?

I'm confused by the array offered online that supposedly fit as OE and range from $24-$80.

Don't want to get an inferior or incompatible part.

Ray

First of all, if you have a questionable cat, changing the O2 sensors is going to do nothing. What you should be doing is running a scan of the sensors on each bank to see what they are doing; one should be staying pretty much at one voltage while the other cycles back and forth in a sine wave like curve. If both sensors are following the sine wave, the cat is done and nothing is going to save it. And dumping in magic bullet fixes are not going to heal it either.