[Beedub]

Ok so one of my POST cat O2 sensors has gone AGAIN, now I was kinda thinking about getting a specific tune to "delete" the rear post cat sensors , i have Been led to believe they aren't actually doing much apart from check emissions and cat performance. I have code p0141 which is heater circuit not getting upto temp fast enough.... I've cleared the code and it's not coming back at the moment....

Are the secondary sensors something we really need ? Would love some more info on what they are actually doing ?? AFRs and performance is identical.

I'm guessing pre cat sensors are the ones providing fuel trims etc ....