Rear 02 Sensor for 04 RX8 - Mazda or Quality OEM?
 

Guys,

I've had a P0138 code come up a few times (high voltage on O2 sensor - rear/after catalytic). From what I've read this is 99% a sensor about to go bad.

In preparation I've been looking around at pricing. Mazda brand is like $220CDN from the dealer, I can get from Mazmart for probably $200 shipped. Or, places like RockAuto and so on carry Denso & Bosch sensors that are advertised as "exact" fit and I would believe are good quality given the brand for MUCH cheaper. Like $100CDN shipped from RockAuto.

Seeing as the RX8s are pretty finnicky with ignition & emission pieces, what has been the experience here with non-Mazda but good quality parts like Bosch & Denso?

Obviously I'd rather save the $100+ if I can.

Thanks
Ash

I used a OEM Denso one (on downpipe $50) on my RX-7 two years later no problem, have tried Partsource or Napa if it does not work take it back?

Have you read this thread?
https://www.rx8club.com/tech-garage-...change-187112/

Hi Thx for the reply.

Napa wants 220 for an NGK brand, will ask at partsource. I did read that thread but many people were talking about using the mazda brand original part so I thought I'd ask specifically if people had used aftermarket on the rx8 with decent results.

Thx
Ash