P0420 and highflow cats READ THIS

[Midias]

OK for the last 4 years or so I have been running a highflow EPA compliant cat from magnaflow. I have gotten a CEL twice with the code P0420 which is catalyst insufficient or exhaust too dirty. The first time was with my custom exhaust when I went through a huge puddle which was probably the cause. The second time was with my obx exhaust and the same model cat from magnaflow. The light came on one morning then left about 1.5 weeks later on its own.

The differences between the two exhausts is one is 2.5 inch and has an O2 sensor mounted on the top and the other is 3 inch and has the o2 sensor mounted on the side.

So what all this tells me is the cat I have been using is right on the hairy edge of setting off the CEL depending on sensor position and more likely to set it off with a SC.

Now this can be a good or a bad thing

The bad news is you may need to add a new part to keep the CEL off.

The good news is sense it is so close the $5 anti fowler mod should keep that CEL off for good so a simulator is not needed.

Ok that is all any questions just ask.

[Dawgz]

Well the cat u made for me hasnt given me any probs yet. Although i do have a 2.5" system but also im running the URD Type B (for cali spec) o2 simulator.


Im going full 3" this summer, i might need u to make me a new cat

[Dawgz]

also, i forgot to ask u, did u pass emissions or watever with that cat?

[Midias]

also, i forgot to ask u, did u pass emissions or watever with that cat?

I pass the computer every time but we do not have the tailpipe sniffer here.


And if you are going 3 inch this summer there is a good chance I can make you a package deal on an OBX exhaust cat combo because i think I will be going back to 2.5 inch custom with my TRD muffler soon.

I love the Look, sound, fit, and high end of the OBX but I am thinking about reclaiming my low end again. I made new vids check them out.

But on the expressway 5th gear acceleration is still no problem.

[Dawgz]

also, i forgot to ask u, did u pass emissions or watever with that cat?

I pass the computer every time but we do not have the tailpipe sniffer here.


And if you are going 3 inch this summer there is a good chance I can make you a package deal on an OBX exhaust cat combo because i think I will be going back to 2.5 inch custom with my TRD muffler soon.

I love the Look, sound, fit, and high end of the OBX but I am thinking about reclaiming my low end again. I made new vids check them out.

But on the expressway 5th gear acceleration is still no problem.

ok well, we can talk business in a few months

[CamryOnBronze]

I havent had an issue with my full JP setup and a CEL, so far so good...