After Cat O2 delete
 

Is there anyone you guys could recommend to recode my ECU to turn off the after cat O2 sensors? 2002 e53 3.0

thanks for any info!

Not sure how the DME would respond to that but you could call Active Auto Werks, they’re good guys and should give it to you straight.

May I ask why delete the after car O2s? Just curious.


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Well, here is the story, I picked up a 02 e53 3.0 for $600. Yes $600. Needed ignition key tumbler, right front door panel and outside door handle and a serious cleaning. The exhaust bung for the after cat o2 blew out and since they are a pain in the crack to deal with, I was just going to delete them and patch the hole. There were other small issues, usual vacuum leaks, tune-up and oil change but that was about it till yesterday. That's when I found out the head gasket was blown. Anyway, want to get the after cats turned off while I'm replacing the head gasket and getting the head redone.

Sounds like a steal actually, if it runs and drives, that’s awesome. In regard to the O2 bung, the exhaust is stainless steel, you should be able to have any local exhaust shop weld a plate and bung on for id guess around $100, that will be SIGNIFICANTLY cheaper than coding them out, for sure [emoji106]


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Unless you can find an e53 post cat simulator it will be much harder to code out than just fix. Unless you also need to replace the cats.


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Google BMW eu2 tune for m54. It's free! You just need an obd2/inpa cable (about $15 on ebay) and inpa/winkfp which can be downloaded on various forums.

This will eliminate the post cat sensors from the tune and will allow your x to operate properly without therm. A lot of folks that remove their cats and delete the secondary o2 sensors complain of exhaust stink. The engine runs pig rich if you remove the secondary o2 sensors without properly tuning them out. The eu2 tune is the factory tune for BMWs spec'd without cats in other markets.

So this eu2 tune has been done and proven on the X5 ?

I have done the EU2 tune on my '03 530i with same engine. I did it because my car has 400k miles and I was getting cat inefficiency codes.

Car runs well with EU2 tune, at least as good as before. Not sure it's better.

I think I will pass emissions, but am not sure. My sticker is not due until Feb '21.
In my state, pre-'04 cars do not need "readiness" monitors to be on.

I have lost the check engine (SES) light..It does not go on even when I turn the key on.

I just check for codes every couple of weeks or so.

Thoughts-
If you are going to the trouble of patching the bung, it shouldn't be much more work to repair the bung.

Also if you do flash to the EU2 tune and don't like it, you can flash back.

I'm running it on my '01 5mt x5. Everything effduration said applies to the x5 as well. One other thing about the eu2 tune is that it does away with the secondary air pump as well. You can leave it in; it just won't be activated anymore.

That's one thing I really like about the eu2 tune - it really simplifies things and eliminates several common trouble areas that throw hard to diagnose codes.

OBD emissions issue after EU2? And what is the process? With many e53 at 19-20 yr age, this could quickly become Ve EU popular

The ability to pass an emission test with EU2 will vary from state to state. Basically, the check engine light does work but it doesn't come on for the bulb check at key-on. Some of the readiness monitors will show 'not present' (EVAP, SAP, CAT, O2 heaters, etc.). Depending on the software the state checker is using, they could show as 'not ready' or 'not present'. States vary in terms of how many monitors can show 'not ready' while still allowing the car to pass. The stricter states will look for that check engine light at key-on, and the EU2 tune won't pass. In the more lenient states, you can pass with EU2 (if you have no trouble codes set) and 3 or 4 monitors 'not ready'.

I think can have up to two not ready in WI as long as one is EVAP. I've never heard people mention SES light not coming on at key on.

Does the SES light come up on the cluster lamp check? Be interesting to know....

SES probably doesn't come on with UE2 tune.

I just deleted SAP and am wondering if I should delete post cat o2 sensors as well.
Not sure if it changes anything at all, either way?

The reason I'm considering deleting rear o2 sensors is because bmw scanner 1.4 is displaying shadow errors for them, which kinda bugs me, and I cannot get rid of the them.
I know andrewwynn is aware of those stubborn codes

Do you mean the O2 short circuit codes? Those are not real -- BMW scanner shows those for everybody but they don't show up for any other kind of scanner, from what I understand at least.



Second question -- Did deleting the SAP cause any check engine light for you? I have been getting intermittent codes for mine on the Foxwell and BMW Scanner (not on the dash) so I just removed it this weekend. It only took a few minutes so I will put it back in if I get a code.



The pump works fine with a 12v battery, so I'm guessing the valve is bad, but I haven't been able to test the valve yet.

I dont remember the codes for o2 sensor, I'll have to double check.

I removed the SAP physically and coded it out.
I also reset adaptations, removed speed limit and ews.

The SES (service engine soon) light came on after the flash. Not sure why. Maybe because SAP is coded out.
But no check engine light

Never mind, the SES light went out. So all good now, SAP deleted, no codes.

Sorry, did you flash the EU2 tune or code the SAP out in a different way?



I went down an EU2 rabbit hole tonight and now I'm actually thinking I might want to do it.

I coded out SAP with tuner pro just by changing the c_conf_sap value from 0 to 1.

I didn't want to flash EU2 because I think it disables check engine light.

This worked flawless on my e46 for years