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Q: p0432 thrown after replacing cat and both 02 sensors? on 1999 Volkswagen Passat

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The code was thrown again after I replaced the cat, both o2 sensors, plugs and wires. I have checked the SAIP and EGR valves. They all work.

I compared the o2 test readings between bank 1 and bank 2 for all four sensors. They are virtually identical. Difference of .1 volt.

When I changed the plugs, the plugs on bank2 where uniformly lighter than the plugs on bank one, which were uniformly browner.

Any ideas?
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If the secondary sensors are following what the primaries are doing under proper monitoring conditions then you may have cats that aren't up to spec for that vehicle.Follow the other suggestions. Did you replace just one converter or both?
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