Hi all

I got p0420 bank 1, I replaced the exhaust sensor , the first code gone but I got another code which was P0037 O2 Sensor Heater Circuit Low Bank 1 Sensor 2, The mechanic told me we need to replace the front Sensor which sensor 1 as well ? is that logical ?


Thanks all

 

P0420 is catalyst system efficiency







P0037



Bank1 Sensor 2 is the rear oxygen sensor after the cats - did you replace with new??
What vehicle is it??

 

Thanks for replay
Yes I replaced the oxygen sensor after the cats with new one ! , the code was P0420, After replacing , P0420 was gone, and P0037 came !.
Nissan Micra 1.2 2012 dig-s


[QUOTE=
Bank1 Sensor 2 is the rear oxygen sensor after the cats - did you replace with new??
What vehicle is it??[/QUOTE]

 

You do know this is a Subaru forum even though the same principal applies. You need to check your heater voltages going to the sensors before replacing sensors. It could possibly be a fuse or a knackered cat.