2009 RX8 R3 (P0300,P0410,P0411) huge power loss solution
 

Hello Everyone, This thread is only to help someone else with the same problem I had recently.

I own an 2009 RX8 R3 with 69000km (43000 miles) on it. A month ago I began to have some power loss at around 7000 rpm with no check engine and during the month, the power continued to degrade to a point that I was unable to go more that 5000 rpm and difficulty to drive the car at all. At that point I begun to receive check engine with P0411,P0410 and some misfire P0300.

I read/search every single thread here and went to a debug mode.

1- I changed the spark plugs with wires = didn't work !

2- I changed the coils with the D585 coils and 10mm cables = still no change :sweatdrop

3 - With all the reading I begun to suspect the catalytic converter...

4- I removed the catalytic converter and heard rattle noise from it when I rotate it...Confirm the CAT was in pieces but in the middle of it. All that time I never received the P0421 saying my CAT was bad....

Fortunately my CAT was still on the 8 years or 128 000 km (80 000miles) warranty and will be replaced by Mazda at no cost.

I just want to thank all of you that took the time to put all the info in this forum that helped me resolved this frustrating problem.

Frank :Peace:


**** I just realize I put It in the wrong place, can you move it to the series II thread please ****

You need one of these to replace that cat...

https://black-halo-racing.myshopify....onated-midpipe

This topic should be the poster child for searching properly.

Good job, I wish more people were like you.

I wish more people would test parts properly before they just blindly swap them put ...



.

and +100 for you!

but -100 for people who don't think emission compliant matters ...

I am thinking about a catted(shooting flames is cool, but I doubt I can stand the smell) midpipe if my OEM cat goes. Hmmm, I think I will keep looking here.