Miggi_Jiggi

Can someone please tell me if this is a normal reading or do I have to take action?

ECL P0420, I cleared it the took a voltage reading
I have attached a screen shot for your veiwing. Thank you in advanced

2k accord V6 3.0L

ok so I dont know how to upload the jpeg here are the numbers

o2 1x2 voltage reading is .5 to .8 when accelerating
o2 2x2 voltage reading has no data <<< im questioning this one

MAD_MIKE

Secondary O2 sensor should either hold a steady low voltage reading, or if the secondary combustion is not fully happening in the catalyst, the secondary O2 will follow the primary O2s voltage output.

Miggi_Jiggi

Thank you, that kind of made sense to me. I will monitor the numbers while in cruising speed. So far so good, looks like it might have been a false/positive in the ECU

MAD_MIKE

P0420 is a code that takes a bit to set if the catalyst or secondary O2 are failing. If the catalyst is outright dead the code will come back fairly quickly.