What do you guys recommend to replace the O2 sensor? I think the Bosch is cheapest at around $15-20. I know the Mazda OEM is a lot more. Will it make any difference which one I get?



chris

nope, an 02 sensor is an 02 sensor



mike

good, thanks.



I can't afford another MAZDA part like the $10 for a bolt they robbed me on.... :rant:

i paid 15.00 bucks for a rear main eccentric shaft oil seal https://www.nopistons.com/forums/pub...IR#>/boink.gif

i thought bosch had 4wire ones and the oem ones are like 2 or something like that https://www.nopistons.com/forums/pub...IR#>/dunno.gif

I got a Bosch. Seems to work fine with my A/F gauge.

Kinda on topic...if I get an aftermarket Bonez downpipe, does this affect the o2 sensor placement?

My HKS downpipe has a place for the O2 sensor pretty much exactly where the stock one was. I think the Bonez dp is similar.

How do I know when my o2 sensor is no longer working?

With the engine warmed up, put a voltmeter on the sensor. If its a single-wire one like mine, you should read between 0 and 1 volt between that wire and ground. If you have doubts about it, you should probably just replace it.