Exhaust Issues

[Bigpapa]

I have a 2014 GMC 1500 with a 5.3L. I recently replaced my CATs because I was getting the dreaded P0430 code. SO I put new Magnaflow exhaust systems as well as brand new sensors in it. I got it all in and about a day after I got it all installed I got the same code P04030. I double checked the seals and sensors and looked at the live data and it all looks on the level...the only other thing I can think is that there is a wiring issue with it...the connector on bank 2 sensor 2 looks in order so I'm a little confused as to why I'm still getting this code other than there is a ground or an electrical issue I haven't looked at. 

[silveradosid]

as dumb as it sounds , i read another post  on this problem of using aftermarket cats and the solution was to put oem cats on and the problem was fixed

[calgator73]

On 1/12/2021 at 6:53 PM, Bigpapa said:

I have a 2014 GMC 1500 with a 5.3L. I recently replaced my CATs because I was getting the dreaded P0430 code. SO I put new Magnaflow exhaust systems as well as brand new sensors in it. I got it all in and about a day after I got it all installed I got the same code P04030. I double checked the seals and sensors and looked at the live data and it all looks on the level...the only other thing I can think is that there is a wiring issue with it...the connector on bank 2 sensor 2 looks in order so I'm a little confused as to why I'm still getting this code other than there is a ground or an electrical issue I haven't looked at. 

Check this

 

 

[Eddie 70]

2 hours ago, calgator73 said:

Check this

 

 

Good video. I learned something new!!

[newdude]

On 1/12/2021 at 6:53 PM, Bigpapa said:

I have a 2014 GMC 1500 with a 5.3L. I recently replaced my CATs because I was getting the dreaded P0430 code. SO I put new Magnaflow exhaust systems as well as brand new sensors in it. I got it all in and about a day after I got it all installed I got the same code P04030. I double checked the seals and sensors and looked at the live data and it all looks on the level...the only other thing I can think is that there is a wiring issue with it...the connector on bank 2 sensor 2 looks in order so I'm a little confused as to why I'm still getting this code other than there is a ground or an electrical issue I haven't looked at. 

 

 

Did you get the correct OEM converter Y pipe with the proper emissions level?  

[Bigpapa]

On 1/13/2021 at 5:34 AM, silveradosid said:

as dumb as it sounds , i read another post  on this problem of using aftermarket cats and the solution was to put oem cats on and the problem was fixed

That’s what I’m starting to think as well