Increases Emission Error

I recently did a secondary Cat delete on my e92 m3 and started to incur a Increased Emission error . I did not touch the primary . I called the shop and he basically said that it’s a sensor and nothing related to his work . Strange if you ask me . I ran a OBD on it and these are the following codes it spat out :

P2432
P2430
P279D
P279

Thanks for your help guys !!

Do some research, none of those codes have anything to do with 02 sensors.

Even if it was, they aren't related to chopping off the secondary cats.

tdott wrote

Do some research, none of those codes have anything to do with 02 sensors.

Even if it was, they aren't related to chopping off the secondary cats.

I did do some research and it appears there are no definitive answer out there . From what I read it might be a crack in the hose line

I know I had my secondary cats removed about 3 years ago (primaries still present) and have yet to receive an increased emissions code.:

Have you looked through this post?

https://www.m3post.com/forums/showthread.php?t=928325

Scan with a bmw scanner, those generic codes won't give you much to diagnose from

kscarrol wrote

Have you looked through this post?

https://www.m3post.com/forums/showthread.php?t=928325

kscarrol wrote

Have you looked through this post?

https://www.m3post.com/forums/showthread.php?t=928325

Thank you very much !!

What's the mileage and model year of your car...?

GORDON.M3 wrote

What's the mileage and model year of your car...?

kscarrol wrote

Have you looked through this post?

https://www.m3post.com/forums/showthread.php?t=928325

GORDON.M3 wrote

What's the mileage and model year of your car...?

E92 M3 Comp 2011

91000KM

Skhan109 wrote

E92 M3 Comp 2011

91000KM

Original O2s, then it's normal, time to go.
My car has 80,000km now and I have done the primary O2s 3 times already.

GORDON.M3 wrote

Skhan109 wrote

E92 M3 Comp 2011

91000KM

Original O2s, then it's normal, time to go.
My car has 80,000km now and I have done the primary O2s 3 times already.

GORDON.M3 wrote

Skhan109 wrote

E92 M3 Comp 2011

91000KM

Original O2s, then it's normal, time to go.
My car has 80,000km now and I have done the primary O2s 3 times already.

Thanks buddy ! I'm going to get it fixed Tom . What's your setup like? Would could be reason for it failing

Skhan109 wrote

Thanks buddy ! I'm going to get it fixed Tom . What's your setup like? Would could be reason for it failing

Mine never failed, I never had codes, the dealership/independent shops I go to recommended me to do them. Each time I did them, my fuel efficiency improved.
The previous owner of my car also did them at the dealership before I got the car.

GORDON.M3 wrote

Original O2s, then it's normal, time to go.
My car has 80,000km now and I have done the primary O2s 3 times already.

What? This is NOT normal.

doogee wrote

What? This is NOT normal.

doogee is right, it isn't normal for them to go bad so soon but for the s65 its in of best interests to have them replaced earlier as preventative maintenance.

Noticeable improvement of fuel economy as they no longer read as accurate as they once were, the car is also a lot more responsive.

I still have primary o2 sensors that had roughly 30k,KM on it, if you want them let me now.

GORDON.M3 wrote

doogee wrote

What? This is NOT normal.

doogee is right, it isn't normal for them to go bad so soon but for the s65 its in of best interests to have them replaced earlier as preventative maintenance.

Noticeable improvement of fuel economy as they no longer read as accurate as they once were, the car is also a lot more responsive.

I still have primary o2 sensors that had roughly 30k,KM on it, if you want them let me now.

GORDON.M3 wrote

doogee wrote

What? This is NOT normal.

doogee is right, it isn't normal for them to go bad so soon but for the s65 its in of best interests to have them replaced earlier as preventative maintenance.

Noticeable improvement of fuel economy as they no longer read as accurate as they once were, the car is also a lot more responsive.

I still have primary o2 sensors that had roughly 30k,KM on it, if you want them let me now.

If I was to get a tune since I'm taking out the primary cat .. would this help with the problem or no ?

Skhan109 wrote

If I was to get a tune since I'm taking out the primary cat .. would this help with the problem or no ?

Regardless of taking out the primary cat or not, you still need the o2 sensors.

The o2 sensors are a closed-loop system measuring the unburnt hydrocarbons in your exhaust gasses as they escape the rear end. When you are running a car without o2s its called open-loop. Getting a tune only suppresses the light from coming on. If you have other problems/codes happening on your engine, it might not be only just the o2 sensors. Have the car properly diagnosed (take it to a professional instead of doing guess work on the forum) before you start dumping money on replacing things that might not potentially solve your problem.

GORDON.M3 wrote

Skhan109 wrote

If I was to get a tune since I'm taking out the primary cat .. would this help with the problem or no ?

Regardless of taking out the primary cat or not, you still need the o2 sensors.

The o2 sensors are a closed-loop system measuring the unburnt hydrocarbons in your exhaust gasses as they escape the rear end. When you are running a car without o2s its called open-loop. Getting a tune only suppresses the light from coming on. If you have other problems/codes happening on your engine, it might not be only just the o2 sensors. Have the car properly diagnosed (take it to a professional instead of doing guess work on the forum) before you start dumping money on replacing things that might not potentially solve your problem.

GORDON.M3 wrote

Skhan109 wrote

If I was to get a tune since I'm taking out the primary cat .. would this help with the problem or no ?

Regardless of taking out the primary cat or not, you still need the o2 sensors.

The o2 sensors are a closed-loop system measuring the unburnt hydrocarbons in your exhaust gasses as they escape the rear end. When you are running a car without o2s its called open-loop. Getting a tune only suppresses the light from coming on. If you have other problems/codes happening on your engine, it might not be only just the o2 sensors. Have the car properly diagnosed (take it to a professional instead of doing guess work on the forum) before you start dumping money on replacing things that might not potentially solve your problem.

Thanks Gordon !!