Check Engine - Emissions

[m34m]

Hoping for some guidance here. E92M3 with 8000 miles and getting the check engine increased emissions thing. Likely a oxygen sensor. I currently have stock exhaust but have MPE ready to install. My plan was to install exhaust and see how I like the sound and if I want more then add test pipes or X pipe. Given this what approach would you take? Get this oxygen sensor thing fixed or ignore it and go ahead with exhaust mods and then code out CEL if I get X pipe?

[BOOF-M3]

Originally Posted by m34m

Hoping for some guidance here. E92M3 with 8000 miles and getting the check engine increased emissions thing. Likely a oxygen sensor. I currently have stock exhaust but have MPE ready to install. My plan was to install exhaust and see how I like the sound and if I want more then add test pipes or X pipe. Given this what approach would you take? Get this oxygen sensor thing fixed or ignore it and go ahead with exhaust mods and then code out CEL if I get X pipe?

The test pipes will surely set off the CEL which I reset with my OBDII tool each time. But obviously you haven't installed them yet. I would think you need to check the code and at a minimum reset it depending on what the code is or make the repair. If it's an O2 sensor then it could/will eventually foul your plugs at the very least.

[Mvy]

Pull the codes and replace the O2 if needed. If you intend to do cross pipes or test pipes, I'd recommend a tune to prevent further CEL issues. Otherwise you will have to reset it often.

[JsL]

Read the code first. A lot of other things besides a O2 sensor can cause the "increased emissions" message.

Your car is trying to tell you something is wrong, don't assume it's a simple post cat o2.

I would read the code, fix the code, then install the mpe. If not loud enough, find someone local with an xpipe or testpipes to see if that is the level of loudness you're looking for. Adding test pipes or xpipe to anything other than a stock muffler adds a lot of volume.

[rdoctor]

Originally Posted by JsL

Read the code first. A lot of other things besides a O2 sensor can cause the "increased emissions" message.

Your car is trying to tell you something is wrong, don't assume it's a simple post cat o2.

I would read the code, fix the code, then install the mpe. If not loud enough, find someone local with an xpipe or testpipes to see if that is the level of loudness you're looking for. Adding test pipes or xpipe to anything other than a stock muffler adds a lot of volume.

I agree. Many things can trigger the "increased emissions" message...including a low battery state. Ask me how I know. Oh, and also one of the other common reasons for this message other than an O2 sensor is the fuel rail pressure sensor (link below). I've replaced both on my car.

https://www.turnermotorsport.com/p-2...0-f01-f10-f12/

[xxxian08]

Strangely enough I got "increased emissions" Monday. Turns out the throttle actuators are failing. 85,000 miles. Yay...

[Evolve Automotive]

Get the code read first before making any purchases of what you think could be wrong. Post here and we can give you our feedback, but if your running the stock xpipe it most likely is a 02 sensor.

[BPMSport]

Originally Posted by JsL

Read the code first. A lot of other things besides a O2 sensor can cause the "increased emissions" message.

Your car is trying to tell you something is wrong, don't assume it's a simple post cat o2.

I would read the code, fix the code, then install the mpe. If not loud enough, find someone local with an xpipe or testpipes to see if that is the level of loudness you're looking for. Adding test pipes or xpipe to anything other than a stock muffler adds a lot of volume.

This. Increased emissions could be anything from the gas cap not being on tight to misfire issues.

[Edward]

As many have said, it can be a variety of things. Installing your MPE now won't affect your ability to diagnose or fix whatever issue it is since the MPE is post factory X pipe (resonator and primary and secondary cats and the O2 bungs etc.

Pull codes, diagnose, fix issue, then determine if you want more sound post MPE.

Originally Posted by xxxian08

Strangely enough I got "increased emissions" Monday. Turns out the throttle actuators are failing. 85,000 miles. Yay...

I think that BMW was forced to warranty TB actuators to 10 years 100k miles at least in the state of CA as a CARB thing. Might want to check with VA if that's where you are.

[SLC Steve]

I had an increased emissions code as well. It was the secondary air pump sensor. Replaced the sensor and the code has been cleared for about 200 miles now.

[m34m]

Thanks for the great feedback guys. I'm taking to dealer tomorrow morning and will post the results when I find out what's going on. Incidentally my car's warranty expired July 31. Yay.

[m34m]

Hey guys quick update. It was in fact an oxygen sensor gone bad. As mentioned the car is only a few weeks out of warranty but the dealership was cool enough to cover this repair entirely. Thanks for all the feedback.