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The P0420 code is for a bad cat that code will come back they can be slow setting. What is a lambda sensor?

Saturntech9, Lambda = O2 sensor.

P0172 is system running too rich and this would result in the catalytic converter failing very fast as it is being flooded with fuel, causing it to overheat.

You need to check why engine is running rich. It could be faulty injectors or clogged air intakes.

Thanks for the slange o2 sensor conversion khlow2008 lol.

This lambda sensor originated from European vehicles pre-OBD-II.

Come to think of it in one of my gm training classes they did mention a lambda sensor lol it was a long time ago and never really heard much more about that name.

The term is obsolete now. Technically O2 sensors are out too. We have HO2S now which is being replaced by A/F sensors. Maybe the manufacturers are trying to confuse us so we become obsolete too.

Unless the car or robot can fix it they need us lol. You should have seen how bad it was with the gm ev1 while we were factory trained for it we had to go back to our hotel rooms at night and replace pages in the service manuals with new revised pages like 20-30 pages.I talked with the designers of the car that were at the gm training center and they had 6 months to make a prototype car a production car. So at that point I said I was sorry for all the bad things I said about the car lol.