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Old 09-09-2012, 06:03 PM   #1
pbellone
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2004 L-300 P0420 Cat issue

I have a 2004 L-300 with a P0420 low cat efficiency code. My computer shows a normal upstream voltage rise/fall at idle. The downstream shows a steady state but pretty low. When I press the pedal and raise the rpm the downstream starts tracking the upstream sensor. I replaced the sensor as the place I bought from (junkyard auto sales) couldn't confirm the correct sensor installed when repairing the problems it found when they got it. There is the tiniest exhaust leak blowing out a pin hole at the forward weld on the cat.

Is this a clear cut suck it up and replace the cat? Anyone ever have this code to fix?
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catalytic , converter , p0420
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