I'm not saying they don't fail, bb - just that it's easy to jump to conclusions.
Similarly, as I mentioned, a high lambda reading during the emissions test does not automatically condemn a lambda sensor.
I have two cars - a 1993 Mercedes W124 with 175k on the clock, and a '99 Volvo S80 with 168k. Both have their original catalytic converter, and both were well within limits at their last MoT test.
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