| johnsjmc |
08-14-2004 07:43 AM |
The cat is still working fine. Notice the HC and NOx are still well within limits even though the CO was high. The front section of a 3 way cat works by stripping the oxygen from the NOx and then adds it to the HC and CO in the rear section to produce more CO2 and some H2O. A normal reading from either of the 2 gases from one section and normal NOx from the other shows a Cat working as expected .If it has failed you usually see all 3 gases as high.If the matrix has become clogged (from a partial meltdown)you would not have seen the pass after restoring the mixtures with a new O2 sensor either.
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