OK the car had a clogged cat about a year ago and the guy who had it fitted a universal fit Cat that gave out recently and threw this code. It seems like the cat is falling apart now because its rattling all over the place. The car runs well and has not thrown any other codes so I am thinking that the 02 sensors are bad also and as a result distroyed the cat. The car has 92000 miles on it.

How many O2 sensors are on that side and do I need to replace all of them or just the two that sit in front and behind the cat.

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With best regards

Al