firstly i had a problem catalitic convertor it died 15000 km than i bought a chinese one and 1 week later i had a new problem from rear oxygen sensor , i bought new rear oxygen sensor and my problem is going on , my new sensor is not working, i will fire up ******* this car , it made me unbelievably tired , pls if you know a solution tell me , i m running stupidly uncomfortable and of course with engine light

 

Could you please tell us more about your car?
What are your problems, aside from the check engine light being on?

 

Dont put that china crap on your car lol

 

problem is that uncomfortable driving, rear oxygen sensor provides this and engine control light is on from rear sensor coz after the cat sensor there was a equipment for misleading when i bought the new oxygen sensor (front) 1 week later check engine light come from decient catalyctc , rear oxygen sensor sometimes work, sometimes it is not , i m thinking that to use catless or new cataclytc coz rear oxygen sensor is already new, what is your advise, what should i do... everyweek i m going to mazda service and i m trying to solve this ******* problem, i will fire up this car ...

 

You should get your cat inspected and check your oxygen sensor as well, maybe it is poorly connected.
What do you mean with uncomfortable driving?
Do you have problems starting the car when hot?

I'm sorry to make so many questions but helping through a forum is not the easiest thing on earth.

 

uncomfortable driving means that when i stop the deep there is shake forward down, how can i explain for example especially when i run 1 gear and 2 gear with normal gas there is really powerfull swaying, this problem can be generally when it cold but sometimes i feel when it be hot

 

This sounds strange.
How are your motor mounts?
Could you please tell us more about your car? km, maintenance done etc?

 

km is 17500, excusme i didnt understand motor mount , there is just straight pipe exhaust coz opened it maybe it could be a problem in it but it was normal, car is stock and there is no problem without this, when i control checking light now problem is looking rear oxygen sensor and damaged oxygen sensor can uncomfortable running , but it is new one maybe catalytc is not orginal so it cannot be work normally from cataltytc , i think that to catless , can cat be interferrence to exhaustion...

 

Changing the catalytic converter shouldn't cause the car to run poorly. There are users that simply remove the cat and get along with the engine light without issues.
If the problems started while removing\changing the catalyzer i suggest you inspect the new one and the rear oxygen sensor. Maybe it was damaged during the installation...
Otherwise we'll have to check for other potential causes

 

thank you so much, firstly i will try to run with catless , if i give 2000$ and the problem goes on, it really make me crazy and i will attack to mazdas headquarter thanks

 

Nevermind the help!
Instead of getting lost in your country with expensive parts etc you should contact Mazmart on this board, they really have competitive prices for replacement parts!

 

are there any users to drive catless rx8, can they share their experiences?

 

There are hundreds, you may want to use the search button to discover their opinions since this is a well discussed topic!

 

I ran catless for a long time, no problem, just the light.
Removing the catalyst material from the stock piping works best, a straight pipe in place of the cat will make the car twice as loud....

 

for the record, most "crap" came from China these days.

 

Did you fix your problem or did you end up "fire up *******" your car? I'm not even sure what that phrase means but it seems like you're saying you might set your car on fire out of anger! LOL.

Please don't do that! As an option, you did mention "attack Mazda's headquarters"! That might be a more prudent solution.