Mazda 3 engine light problem

[Canadianbacon]

I have a 2010 mazda 3 GT 65k sedan and i recently removed the 2nd cat and put in a racepipe, a day or 2 later (i have corksport exhaust on from before)

I get a check engine light P0139 Bank 1 Sensor 2. slow response or something not really sure what it is or causing

As far as i know the 2nd catayst is not monitored by anything could use some advice thanks.

[Cab0oze]

My advice - do the environment and your car a big favor and put your cat back in. Problem solved.

[Canadianbacon]

other non environment ideas?

[Hyperion]

Reset/Clear the code.
If it comes back, you made need a new O2 sensor.

[Canadianbacon]

Reset/Clear the code.
If it comes back, you made need a new O2 sensor.

Thanks! i reset the code no light so far drove like 10km or so lol. btw one last thing... Will the dealership replace the sensor under warranty or will i need to put the 2nd cat back on?

[S.F.W.]

Thanks! i reset the code no light so far drove like 10km or so lol. btw one last thing... Will the dealership replace the sensor under warranty or will i need to put the 2nd cat back on?
not likely a dealer will warranty the O2 sensor with a racepipe.