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Can you see both O2 sensor patterns at the same time? When they match it trips the P0420 code. There needs to be a lag in the second pattern for the code to go away. This is best seen on a graphing scanner like a Modis or a laptop with the correct software. We have mostly Fords at work and we have the same computer programs the dealers have. This has been great being able to flash computers and diagnose drivability issues.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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