O2 sensor replacement
 

Hello everyone.
i am here looking for some help. The O2 sensor before the catalyc converter in my 2002 mp5 went bad and is in need of replacement. i called the dealership and they are asking for about $200. then i called every auto parts store and they only have the universal ones (which would involve sutting wires) or the oem fitting ones for more than the dealership. So, my question is, has anyone gone through this problem and what solution did you use? also, if i change 1 of the 2 O2 sensor, should i replace the other? any feedback will be appreciated.
thanks in advance

What code prompted this change?

if you want an oem o2 sensor contact Ken @ protegegarage.com or one of our sponsors like Bob Moore Mazda and Trussville Mazda.

You don't have to cut any wires for the universal ones. I just put one in the other day. They come with everything you'll need and it's easy like pie. :)

its been a little while since i first checked it and i forgot the exact code. all i know its one of the PO420-PO422, within those 3.

cool, i might try this out as my last resort. i always want to replace everything oem of better, but i appreciate the info. if i decide to do that, i might have to get back to you for some install info. thanks again

P0421?

https://www.mazda3club.com/3rd-gen-protege-mazdaspeed-p5-mp3-26/engine-code-po421-41800/