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Mid Atlantic
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Old 11-07-2013, 03:01 PM   #1
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Join Date: Apr 2010
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My Ride: 04 M3 JB/Cinn
Anyone in NOVA running catless and with the SAP delete?

My car is registered in NOVA and I am running catless on my E46 M. I already have my O'2 is a ready/passing state so I can pass emissions.

However I am planning to do my SAP delete soon and will need to have that put in a ready/passing state as well so I do not get a CEL light.

My question is... is there anyone in NOVA that is running catless and with a SAP delete that has both sensors in a ready/passing state and not had any issues passing emissions?

I did some searching and all I found some states only allow one sensor to be in a ready/passing state. I do not know if VA is one of those states.

If I won't pass it's not worth it for a few lb's of weight savings and a cleaner engine bay.

Thank you
2004 Jet Black/Cinnamon 6spd ///M3
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Old 11-09-2013, 01:37 PM   #2
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How about either?

Anyone running catless or with the SAP delete?

I know someone on here from NOVA has to be doing either if not both..
2004 Jet Black/Cinnamon 6spd ///M3
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Old 11-27-2013, 01:21 PM   #3
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My 01 330ci passed emissions inspection with SAP delete.

on M3's deleting the DTC's for post 02's set the monitors to ready.

So in essence deleting the DTC's for SAP, and POST 02's it will pass.

Originally Posted by p0lar View Post
There are two ways that DTCs are commonly deleted, or at least suppressed, within the MSS50/MSS52/MSS54/MSS54HP, and several 'uncommon' ways which won't be covered.

Let's start by learning how to identify a DTC string within the DME. A firm understanding of the DTC errors and their respective codes themselves will be of great assistance. NikolaiD has posted an excellent reference/list that can be located here.

Once you have an idea of which DTC you'd like to suppress, it's important to understand the actual binary string within the DME that represents your DTC. These strings are not located in the same position in all binaries. I'll do my best to provide a list of each DTC and location within each version, but will probably only start with the most commonly-suppressed DTCs for the time being.

The string is 14 bytes long, and generally starts with the hexadecimal DTC code itself, and finishes with a 'FF' terminator. For example, if we look at NikolaiD's chart, we can find that code 170 (AA), 'Minimum flow of secondary air', which is most commonly associated with the secondary air pump delete, has a code of 'AA'. Thus, within a sample 211323002501JD79 MSS54HP DME, we find a 14-byte string at offset 0xE3BE representing that particular DTC that looks like the following:

AA 01 01 01 01 01 01 00 01 02 03 28 27 FF
The first method, and coincidentally also the easiest, I'll mention is the one that I believe to be most appropriate (I reserve the right to change my opinion).

To suppress this DTC, simply alter the string by replacing the 13[sup]th[/sup] byte with '00' as follows:

AA 01 01 01 01 01 01 00 01 02 03 28 00 FF
The second method is to actually zero out the entire 14-byte string as follows:

00 00 00 00 00 00 00 00 00 00 00 00 00 00

Regardless of which method you employ, the DME's errors must be cleared after reflashing the DME with the updated binary.

Originally Posted by m3vertsmg2 View Post

Will this only suppress the CEL? Will it also set the secondary air pump emissions monitor to ready?


Originally Posted by terraphantm View Post
There is a no EOBD variant for the E46 M3. But since we have much finer control of the DME nowadays, I don't really recommend flashing it (since it would disable OBD altogether). You're best off turning off the error codes you want to turn off. It has been reported that 0'ing out the entire string for the cat efficiency codes sets the monitors to ready.
Bilstein HD's | E30 M3 FCAB's | H&R OE Sports | F+R strut bars | Self tuned 027 93 octane chip | KoseiK1's on R888's | + crazy OCD maintenance

Last edited by new//M3fan; 11-27-2013 at 02:09 PM.
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