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This is by far the best video I've seen which gives two ways to tell if your catalytic converter is bad. In a nutshell, Eric the Car Guy uses two methods to diagnose a bad converter: He uses a scan tool which uses live data to do just what you are looking at. He is checking to see how the downstream O2 sensor is behaving. Basically it should be fairly ...


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The OP resolved this issue as per his comment: The problem has been solved by changing one coil and cat repair. So the reason for the misfire was a bad coil, while the catalytic converter had to be "repaired", possibly replaced due to clogging.


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Bank 2 Sensor 2 seems stuck rich. I'm more suspect of the downstream Bank 2 sensor - it's a flat line. As long as it's up to temperature, it should show swings back and forth relative to the upstream sensors. I'm not sure you're hot enough (Not ECT, catalyst temperature). I'd love to see the same graphs after some spirited driving. It appears they went ...


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Typically, modern cars have two O2 sensors (upstream and downstream) per bank. Your code indicates that you have at least two banks. I don't really believe your engine would have more than two banks, so two banks it is. Thus, there are 4 sensors: downstream bank 1, upstream bank 1, downstream bank 2 and upstream bank 2. The two sensors per bank are used ...


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While in theory this could be caused by a faulty O2 sensor reporting invalid data, I believe it is more typical for this kind of error to actually be what it says, i.e. catalyst system efficiency is below threshold. Have you replaced your catalytic converter? Is it original or aftermarket? I would start the diagnosis by trying to replace the cat. Yes, it is ...


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