Can this be caused by bad injectors? How does one diagnose minus visiting dealership?
Note: My AFR is also reading 22.4???
I have a fault code stuck lean.
But:
The car has a CAT delete with 90 degree spacer which is why I think the code popped up.
Next,
The AFR is from Innovate which is known to fail. That is, it "was" working several months but started "wigging out" and reads 22.4 all the time.

I either have a bad AFR or something is truly causing the engine to be badly lean.
Any ideas???
Thanks.

 

Nobody???

 

From what I know and/or read, a lean reading at the post cat sensor means the temperature is lower, not the fuel mixture nor the O2. The purpose of the CAT is one to minimize the CO emission and two, to convert unused fuel into CO2 and H2O. It does both buy creating a chemical reaction that creates heat. More unused fuel, the temperature is higher as the reaction is larger/longer. Less fuel equals less reaction so lower temperature, but you have not CAT so there is no reaction at all and therefore no additional heat at all. The post sensor may have a higher range than the precat.

By removing the sensor from the exhaust stream, the temperature in the extender may be low enough to trigger the code. I would think that if your fuel was way off the precat O2 would throw a code.

 

So, is it fair to say if I clear the fault code and it comes back it is likely because the 90 degree O2 sensor fooler is the cause (root no CAT converter)?

I need to take a 12 hour drive and am not sure how to handle this.

Would the ecu richen the mixture in a stuck lean condition?

I have been told that my car smells rich and I say no because it has a stcu lean code or that the smell is from a cat delete as we do not have emissions where I live.

Comments?

 

So, Probably the absolute best article on how to handle this exists on the following link. And, the article does indeed confirm my thoughts. One could very well have bad injectors, or a fuel pressure problem.

I suggest folks read the article.

https://www.vehicleservicepros.com/in-the-bay/article/10853717/how-to-diagnose-a-fuel-trim-issue-on-a-2005-mini-cooper-with-a-p2096-check-engine-light-code-tool-briefing-professional-tool-equipment-news

 

I did a quick review of the article you posted a link to. Did I miss something or did the car in the post have a CAT?

You have a car without a CAT, its throwing a post cat code and smells rich. What issues do you get with deleting a CAT are? Hint - see the first sentence in this paragraph.

Do you know anybody named Occam?

 

Not sure your point.
My personal thought is low fuel pressure or dirty injectors can cause the lean condition and code as described by the article. As for the AFR it pegged at 22.4 exactly the same time as the fault code appeared.

There are some who would say the code is caused by the cat deleted but coincidental only then?

I will need to use my bav tech tool and blast the fault code and see if it comes back.

 

Good article that helps here:

https://www.vehicleservicepros.com/in-the-bay/article/10853717/how-to-diagnose-a-fuel-trim-issue-on-a-2005-mini-cooper-with-a-p2096-check-engine-light-code-tool-briefing-professional-tool-equipment-news