I put a o2 senser in the front part infront of hte Cat, and im now getting code 41, wtf is a o2 sen heater? as for hte other codes any idea how to fix em? the other day it was just showing code 7 but now its throwing 3 and 21 again which were there before but went away and are now back. ne thing will help.

 

https://honda-tech.com/zerothread?id=1171263 this may help

 

Which ecu? p05 will only take a 1 wire o2 sensor, p06 will only take a 4 wire (with heater).