P0151 Code

[Kiing.brett]

Check engine light recently came on after i got car tuned and threw a P0151 O2 sensor circuit low. Was wondering has anyone had this issue and what they did to fix it. Have the cfv Downpipes.

 

[Kiing.brett]

 

[2020FordRaptor]

Everything hooked up properly? You put defoulers on?

 

[Kiing.brett]

Everything hooked up properly? You put defoulers on?

Yeah everything should be hooked up properly had a performance shop do it but didn’t put the defoulers on and was unaware of this. Can you send me a link of what to get.

 

[cheetoduster]

It's always the defoulers. Didn't they come with the downpipes?

 

[Kiing.brett]

It's always the defoulers. Didn't they come with the downpipes?

To be honest I’m not to sure. Sounds like i have to take off downpipes to do this?

 

[cheetoduster]

To be honest I’m not to sure. Sounds like i have to take off downpipes to do this?

No. You remove the O2 sensors, install defoulers where the O2 senors go, then install the O2 sensors in the defoulers.

 

[Kiing.brett]

Just looked at a hsf video on youtube are the o2 spacer on the lower catalytic the same as the defoulers?

 

[cheetoduster]

Just looked at a hsf video on youtube are the o2 spacer on the lower catalytic the same as the defoulers? View attachment 30010

Correct, that extension between the sensor and the threaded bung in the downpipe is the defouler. I'm 99% sure they're only needed for the post-cat O2 sensors.

Disclaimer: I've never done this mod, just seen this issue come up enough here to know.

 

[Kiing.brett]

Now if i have those on what coould be throwing the code. Says something about electrical possibly or even as a exhaust leak?

 

[cheetoduster]

Now if i have those on what coould be throwing the code. Says something about electrical possibly or even as a exhaust leak?

I took a better look at the description of P0151, sensor 1 is before the catalytic converter. This would not be caused by the whole defouler situation. How long ago did you have the downpipes installed? If it were recent I'd talk to the shop.

 

[2020FordRaptor]

Yeah everything should be hooked up properly had a performance shop do it but didn’t put the defoulers on and was unaware of this. Can you send me a link of what to get.

They come with the downpipes.

 

[Kiing.brett]

I took a better look at the description of P0151, sensor 1 is before the catalytic converter. This would not be caused by the whole defouler situation. How long ago did you have the downpipes installed? If it were recent I'd talk to the shop.

I’ll have to give them a call was about three weeks ago.

 

[Kiing.brett]

I took a better look at the description of P0151, sensor 1 is before the catalytic converter. This would not be caused by the whole defouler situation. How long ago did you have the downpipes installed? If it were recent I'd talk to the shop.

If i was to just replace the bank 2 sensor 1 which of these would i need?

 

[cheetoduster]

If i was to just replace the bank 2 sensor 1 which of these would i need? View attachment 30012

I would think one of the Motorcraft up stream sensors, though I'm not sure the difference between the two part numbers. Sometimes one part number replaces another, sometimes one part number applies to certain years and the other to other years, or in this case it could just be Bank1 vs Bank2.

I have not replaced any 02 sensors yet so I'm not completely sure.