I need a little help here. I'm getting a P0430, but it's not consistent. I went to the library and looked up the diagnostic information for a P0430 in Mitchell. For good measure, I looked at the information for a P0420 as well. Under "conditions for setting DTC" for a P0420, one thing it mentions is TPS must be below 1.7%. This isn't mentioned under P0430, though one might expect the conditions for a P0430 to be the same. Can anyone confirm that a P0430 can only be set when TPS is low? It could explain why the code doesn't show up consistently for me.