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fotostars

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Everything posted by fotostars

  1. Just got the same problem. I plotted the O2 sensors before and after the cat on both banks using Durametric. See below graphs: My analysis: Bank 1 has the post sensor oscillating nicely following what the pre sensor measures. The Cat must definitely be shot! For Bank 2, it's more like what I expected, only that the value of the post is pretty high. I was hoping to see it stable around 0.45V? Anybody can give me some feedback and an educated analysis of the graphs Am I right? Do I just have a bad cat on Bank 1 and sensors are fine? It is with the Engine at Idle after a 10min drive (so warm everything).... Thanks! Rich. PS: It is on a US 996 C4S 2002 , 6 spd with 39K miles and quiet a few track days in the past 6 months... :-)
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