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Discussion Starter · #21 ·
..both cat converters replaced at the same time..
My JX35 is just over 150k and I’m also getting random cat/down stream O2 sensor errors. I haven’t brought it to the dealership for a proper inspection, but I’m worried mine will need to be replaced soon. Please let us know what installed-aftermarket cats are going for. A quick amazon search shows the hardware goes for only a few hundred bucks.
 

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I had the same CEL for the catalytic converter on multiple occasions, tried a catalytic converter additive that's supposed to clean it, worked for a few weeks, then the light came back on. I read on the Q50 forum(I have a few Infinitis) that it also could indicate a fouled air filter, and or a bad gas cap, so I replaced both after about 3K miles, (kick on wood) I have not had an issue. It was $10 for the filter and $30 for the gas cap. I would try both of those before spending $4K-$6K on replacement cat converters.
 
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