Option to delete SES light triggers for cat delete

For reasons I won't get into, I am NOT interested in getting a tune. I am also not interested in piggyback solutions like the Akra delete-r or the BMS "downpipe fix" (which doesn't work).

I just need someone to get into my stock programming and delete the DTCs that show up when you remove the cats.

I'm getting frustrated because I help out a ton of forum members with various coding/programming features on their M3s all the time but that's something I can't do myself and apparently there's no one to help

kaiv wrote

For reasons I won't get into, I am NOT interested in getting a tune. I am also not interested in piggyback solutions like the Akra delete-r or the BMS "downpipe fix" (which doesn't work).

I just need someone to get into my stock programming and delete the DTCs that show up when you remove the cats.

I'm getting frustrated because I help out a ton of forum members with various coding/programming features on their M3s all the time but that's something I can't do myself and apparently there's no one to help

I hear you. However, this would require a tune. Is the reason you don't want a tune is that the dealer will find out if there is a catastrophe? Either way if they start a PUMA case and check the DME they will see that the car has been re-flashed.

At this point might as well get some fine tuning due to the lack of primary cats.

Sorry couldn't help more than that.

Dave

There's no way to do it properly other than a device that will clear faults like the P3 gauge or Delete-R.

You can play with extenders, but on a Catless setup this will likely not work. Another way is wiring certain components into oxygen sensor wiring, but this is worse than getting proper software.

I have some black tape you can use. Seriously, what do you want? No tune, no delete-r, no sim, no bms dpfix.

Use mechanical O2 extenders. They work fine. I ran than in my old car for q while. No cats, no tune, no CEL

Can you relocate the rear O2 sensors to someplace exposed to the atmosphere?

I'm no expert with the electronics so maybe somebody else can explain- why hasn't anybody come up with a way to relocate the second O2 sensor and put it behind the REAR cats, while eliminating the front, more restrictive ones?

Kaiv,

I would look at the Delete-R a little more. Its a great solution if you don't want to run a tune and completely transparent to the rest of the car. I have run the Delete-R for a few months now with no issues. I also wanted to stick to the OE 240E software. The installation is very clean.

Stainless 45 wrote

I'm no expert with the electronics so maybe somebody else can explain- why hasn't anybody come up with a way to relocate the second O2 sensor and put it behind the REAR cats, while eliminating the front, more restrictive ones?

You likely still throw a code if the front cats are deleted.

The bms dp fix does work. I have one. But it is nla.

Dave07997S wrote

I hear you. However, this would require a tune. Is the reason you don't want a tune is that the dealer will find out if there is a catastrophe? Either way if they start a PUMA case and check the DME they will see that the car has been re-flashed.

At this point might as well get some fine tuning due to the lack of primary cats.

Sorry couldn't help more than that.

Dave

Thanks Dave, but no this is isn't the reason.

pbonsalb wrote

I have some black tape you can use. Seriously, what do you want? No tune, no delete-r, no sim, no bms dpfix.

I don't think you're understanding clearly. Please re-read my request

If a "tuner" can tweak vanos timing, ignition timing and whatever other parameters; why can't they do the cat delete alone and leave everything else intact and stock?!

s85e90 wrote

Use mechanical O2 extenders. They work fine. I ran than in my old car for q while. No cats, no tune, no CEL

Not convinced this would work on this particular car ahah

JEllis wrote

Kaiv,

I would look at the Delete-R a little more. Its a great solution if you don't want to run a tune and completely transparent to the rest of the car. I have run the Delete-R for a few months now with no issues. I also wanted to stick to the OE 240E software. The installation is very clean.

Thanks Jellis, I'll take a second closer look at it.
I was just under the impression that it just constantly clears the code instead of preventing it from lighting up in the first place (?)

pbonsalb wrote

The bms dp fix does work. I have one. But it is nla.

I tried one a couple years ago and it never worked for me (I suspect that's why they discontinued it).

I am sure you could pay a tuner to do only an 02 sim. But they may charge you more than you want to pay.

I tried Vibrant 02 extenders with the various fittings and they did not work. I tried Delete-R and it worked as far as the CEL goes but I never tried OBD2 plug in inspection with it. I sold it for the $200 I paid and bought a BMS DP Fix for $95 and it works.

No doubt that cat delete and nothing else can be done in a tune. It would be 99.9% factory software other than that one change. But ANY change in the code is considered a tune because it's not OEM.

I bought a scan tool and just erase the codes. Done in 15 seconds. Cost me $30.

kaiv wrote

Thanks Jellis, I'll take a second closer look at it.
I was just under the impression that it just constantly clears the code instead of preventing it from lighting up in the first place (?)

It has kept the light from popping up for me except for one time. It came on for about a minute and then cleared. Other than that one time, its never come on since the install. It might be happening and I don't notice. But either way, job done.

I said the mechanical O2 simulator works and you said not sure it will work. I don't know what else to say. It worked for me and it's now working on my 911 turbo. It's not rocket science it's a mechanical device to pull away the sensor. They are cheap as hell too. Why not? Cheapest option and no messing with the ECU. Otherwise this post makes no sense. People are offering you options but you don't want to do them.

Provide some more detail on what you used in terms of part numbers and restrictor fitting if any, and whether you were fully catless or partially catless.

I spent $70 for a pair of the Vibrant 90 degree 02 extenders with restrictions and they did not work. This is with both cats deleted, as opposed to just test pipes in place of the primary cats or a fabspeed secondary cat delete. Waste of money for me.

There are some "mini cat" 02 extenders that have a mini cat incorporated into them. Obviously they cost more. Bigdaddysgarage sells them. I considered them, but the seller would not offer a money back guarantee if they failed. Too much money to risk. The concept may work, though, since Supersprint sells something like this with its test pipes.

JEllis wrote

It has kept the light from popping up for me except for one time. It came on for about a minute and then cleared. Other than that one time, its never come on since the install. It might be happening and I don't notice. But either way, job done.

sorry to thread jack but does the delete-r allow the car to throw actual engine codes if something were to happen?

pbonsalb wrote  

The bms dp fix does work. I have one. But it is nla.

Can you elaborate? I talked to Terry from BMS and he says there is no option to use the DP fix for catless exhaust cel

BMS sold a DP Fix for the S65 for maybe a year and then stopped. I bought one and it works. Not sure why BMS stopped selling them. You have to adjust it correctly and stronger is counter clockwise rather than clockwise, which is counterintuitive so maybe people adjusted them wrong. Or maybe the EPA went after them as the EPA has done with sellers of similar products. These are for off road use only, obviously.

pbonsalb wrote  

BMS sold a DP Fix for the S65 for maybe a year and then stopped. I bought one and it works. Not sure why BMS stopped selling them. You gave to adjust it correctly and stronger is counter clockwise rather than clockwise, which is counterintuitive do maybe people adjusted them wrong. Or maybe the EPA went after them as the EPA has done with sellers of similar products. These are for off road use only, obviously.

I can understand that if it's a device that will beat emissions but if it's something people are using just to remove the cel and not beat emissions testing, I don't see the problem. And if they are selling it "for off-road use only" what's it to the epa?

The BMS device does not reset CEL. It alters the rear 02 reading. You will have to ask BMS and/or the EPA whether EPA enforcement is an issue. I know of one rear 02 simulator company that stopped selling its device due to EPA threats.