00-05 owners, can you do me a favor and look under your hood and let me know what the first letter of your ABS Modulator serial number is (see example pic below)? I am specifically interested in documenting serial#s and in particular all the letters that a 2000+ unit can start with and I'll explain why below.
91-99 owners, if you're planning to upgrade your ABS modulator with a late model ABS (aka 3rd gen) unit, since they've been discontinued your only option is used. This is a reference thread made in an effort to help confirm that the used unit you're buying is (a) for an NSX and (b) whether or not it will be compatible with TCS. Many here have experienced this upgrade as one of the most noticeable mods that a 91-99 owner can do to their car that significantly enhances the drive and safety aspect.
The NSX, NSX-R and S2000 modulators look identical along with other Honda ABS units. As sellers list either new, used, pulled units (from salvages) and/or sell from overseas, if the Honda barcode sticker on the unit itself has been removed, damaged, or becomes illegible, I'm hoping that referencing the serial#, which is permanently etched into the top-side of the black plastic housing, will be a way to confirm which model modulator it is.
I've been gathering serials from units I've seen in person or for sale online and hope to populate a list to help figure out what any ranges might be. Being that this will have an ongoing learning curve, I apologize ahead of time if any mistakes/bad assumptions are made. This could turn out similar to the snap ring issue where we learned there was no relationship to the VIN and transmission# but I'm hoping that's not the case. I plan to update this post as new info is gathered and hope this might be a collaborative effort so if you're willing to help please pm me or post your serial# (etched into the housing and starts with a giant letter) of your 2000+ unit. Thank you!
Time for a big bowl of serial...
2000+ NSX USDM part# 57110-SL0-Z03
Sticker# (on white label on black plastic housing) 57105SL0 010
Serial# (etched on black plastic housing)
H OSO5 - OOO4 HO1 (confirmed late model NSX ABS by Eric B.)
H ???8 - OOO4 HO1 (confirmed late model NSX ABS by MotoIQ)
H 2H26 - 1O17 HO1 (confirmed late model NSX ABS by Syndicate)
H 4BO3 - OOO7 HO1 (confirmed late model NSX ABS by Truc D.)
H 3F19 - OOO1 HO1 (confirmed late model NSX ABS by MotorMouth93)
H 9T1O - O55O - HO1 (confirmed late model NSX TYPE-S ABS by NZNick)
L 2O27 - OO63 LO1 (unconfirmed - for sale from Japan)
*Current assumptions:
- Any serial# beginning with an "H" is a bona fide late model NSX ABS modulator and is compatible with TCS
- Any serial# beginning with "L" is unknown but have been seen listed for sale as late model NSX ABS modulators BUT also listed as not compatible with TCS because it was "removed/disabled" according to sellers in Japan. If anyone has any more info on "L" serials that would be very helpful.
Note: It's important when searching for this part to know that the number on the ABS modulator housing sticker, 57105SL0 010, is not the part number even though it looks like one and is not in the Acura/Honda database. You may still, however, get some hits searching by that as the seller might only have this number to go off of when listing it for sale as the box (which has the red/white actual part# sticker on it) is probably long gone. If the plastic housing sticker also happens to be missing/removed/illegible you have nothing left to go off of to identify the unit other than the serial number (which is one of the main purposes of this thread).
2002+ NSX-R JDM part# 57110-SL0-N21
Sticker# (on white label on black plastic housing) 57105SL0 N10
Serial# (etched on black plastic housing)
AU 7S1O - OOO1 LOAAA (confirmed late model NSX-R ABS purchased in Japan in 2021 by Kozuchowski)
AU 3F18 - OO11 LOAAA (confirmed late model NSX-R ABS by gotjnco, see pics below)
AU 3F18 - OOO5 LOAAA (confirmed late model NSX-R ABS purchased in Japan in 2024 by Kozuchowski)
*Current assumption:
- Any serial# beginning with an "AU" is a bona fide late model NSX-R ABS modulator and is compatible with TCS. The irony is Type R's did not come with a TCS unit but if you plug this modulator into an NSX with a working TCS unit it functions which could mean R modulators contain similar internals as the "H" serials above but were adjusted for more aggressive driving/brake bias.
Note: It's important when searching for this part to know that the number on the ABS modulator housing sticker, 57105SL0 N10, is not the part number even though it looks like one and is not in the Acura/Honda database. You may still, however, get some hits searching by that as the seller might only have this number to go off of when listing it for sale as the box (which has the red/white actual part# sticker on it) is probably long gone. If the plastic housing sticker also happens to be missing/removed/illegible you have nothing left to go off of to identify the unit other than the serial number (which is one of the main purposes of this thread). The official Acura/Honda part# for a Type-R modulator is 57110-SL0-N21 and is ONLY on the box (see pics down below).
S2000 00-03 (AP1) part# 57110-S2A-J51
Sticker# (on white label on black plastic housing) 57105S2A J50
Serial# (etched on black housing)
C 2H14 -1669 CO1 (confirmed S2K)
C 3F2O - O5O9 CO1 (confirmed S2K)
C 3FO6 - OO2O CO1 (confirmed S2K)
C 2B11- O288 CO1 (confirmed S2K)
C 3BO7 - O463 CO1 (confirmed S2K by Honcho)
C 3KO2 - OO31 CO1 (confirmed S2K by tskkhera)
D 9FO6 - OO9O DO1 (confirmed S2K)
D 9H18 - OO5O DO1 (confirmed S2K)
D 9H29 - O3O? DO1 (unconfirmed S2K)
D 9N16 - O258 DO1 (confirmed S2K)
D 9H29 - O3O4 DO1 (confirmed S2K by mogoraug39)
K 1C14 - O676 KO1 (confirmed S2K by Hirose1117)
*Current assumption:
- Any serial# beginning with "C" "D" or "K" is an S2K ABS modulator that will work on an NSX but is not compatible with TCS.
OTHERS (look like it but aren't)
A 1A25 - O574 AO1 (unknown)
AA 3BO7 - 1O49 AA1 (confirmed 03-04 RSX by i am-motors) *note how close this is to an NSX-R serial
B 9NO9 - OO4O BO1 (unknown)
E 9VO9 - OO4O EO1 (confirmed Honda Insight ZE1)
U ???? - 2O19 UO1 (confirmed Honda Stream, confirmed by Kozuchowski)
*Current assumption: any serial# beginning with a "A" "B" "E" or "U" is not compatible with NSX nor TCS ... i.e. do not buy even though it looks like an NSX ABS.
"?" in serial #'s indicates unable to make out the #'s as they are thinly etched onto the plastic housing and the lighting has to be just right
Example 1 - at the time of this posting, there's a late model ABS listing on ebay [LINK] titled as an NSX ABS with serial K 1C14-0676 KO1. I reached out to the seller and the part# is not available and the sticker removed. After specifically inquiring I was also told that "the TCS has been disabled" on this unit. I reached out to the seller again and asked specifically if he would tell me where this unit came from and he informed me it's from an S2000 in Japan and have updated the data list above. It is unfortunate that the listing title is misleading.
Example 2 - at the time of this posting, there's a late model NSX/S2000 ABS listing on Yahoo Japan [LINK] with the serial C 2B11 - O288 CO1. The "C" serial prefix belongs to S2K's and in this case the black plastic housing sticker 57105S2A J50 confirms that. Therefore purchasing this unit, while compatible, will result in no TCS functionality and is not an NSX modulator even though it's listed as one in the title.
Example Serial # D 9N16 - O258 DO1
Example of NSX-R ABS Modulator markings
Serial# (this example starts with AU 3F18 OO11 LOAAA)
Box sticker# (note: this is also the part# in the Acura/Honda database)
Housing sticker# (note: this is not the part number even though it looks like one and does not show up in the Acura/Honda database but still is a valuable authentication indicator if present)
91-99 owners, if you're planning to upgrade your ABS modulator with a late model ABS (aka 3rd gen) unit, since they've been discontinued your only option is used. This is a reference thread made in an effort to help confirm that the used unit you're buying is (a) for an NSX and (b) whether or not it will be compatible with TCS. Many here have experienced this upgrade as one of the most noticeable mods that a 91-99 owner can do to their car that significantly enhances the drive and safety aspect.
The NSX, NSX-R and S2000 modulators look identical along with other Honda ABS units. As sellers list either new, used, pulled units (from salvages) and/or sell from overseas, if the Honda barcode sticker on the unit itself has been removed, damaged, or becomes illegible, I'm hoping that referencing the serial#, which is permanently etched into the top-side of the black plastic housing, will be a way to confirm which model modulator it is.
I've been gathering serials from units I've seen in person or for sale online and hope to populate a list to help figure out what any ranges might be. Being that this will have an ongoing learning curve, I apologize ahead of time if any mistakes/bad assumptions are made. This could turn out similar to the snap ring issue where we learned there was no relationship to the VIN and transmission# but I'm hoping that's not the case. I plan to update this post as new info is gathered and hope this might be a collaborative effort so if you're willing to help please pm me or post your serial# (etched into the housing and starts with a giant letter) of your 2000+ unit. Thank you!
Time for a big bowl of serial...
2000+ NSX USDM part# 57110-SL0-Z03
Sticker# (on white label on black plastic housing) 57105SL0 010
Serial# (etched on black plastic housing)
H OSO5 - OOO4 HO1 (confirmed late model NSX ABS by Eric B.)
H ???8 - OOO4 HO1 (confirmed late model NSX ABS by MotoIQ)
H 2H26 - 1O17 HO1 (confirmed late model NSX ABS by Syndicate)
H 4BO3 - OOO7 HO1 (confirmed late model NSX ABS by Truc D.)
H 3F19 - OOO1 HO1 (confirmed late model NSX ABS by MotorMouth93)
H 9T1O - O55O - HO1 (confirmed late model NSX TYPE-S ABS by NZNick)
L 2O27 - OO63 LO1 (unconfirmed - for sale from Japan)
*Current assumptions:
- Any serial# beginning with an "H" is a bona fide late model NSX ABS modulator and is compatible with TCS
- Any serial# beginning with "L" is unknown but have been seen listed for sale as late model NSX ABS modulators BUT also listed as not compatible with TCS because it was "removed/disabled" according to sellers in Japan. If anyone has any more info on "L" serials that would be very helpful.
Note: It's important when searching for this part to know that the number on the ABS modulator housing sticker, 57105SL0 010, is not the part number even though it looks like one and is not in the Acura/Honda database. You may still, however, get some hits searching by that as the seller might only have this number to go off of when listing it for sale as the box (which has the red/white actual part# sticker on it) is probably long gone. If the plastic housing sticker also happens to be missing/removed/illegible you have nothing left to go off of to identify the unit other than the serial number (which is one of the main purposes of this thread).
2002+ NSX-R JDM part# 57110-SL0-N21
Sticker# (on white label on black plastic housing) 57105SL0 N10
Serial# (etched on black plastic housing)
AU 7S1O - OOO1 LOAAA (confirmed late model NSX-R ABS purchased in Japan in 2021 by Kozuchowski)
AU 3F18 - OO11 LOAAA (confirmed late model NSX-R ABS by gotjnco, see pics below)
AU 3F18 - OOO5 LOAAA (confirmed late model NSX-R ABS purchased in Japan in 2024 by Kozuchowski)
*Current assumption:
- Any serial# beginning with an "AU" is a bona fide late model NSX-R ABS modulator and is compatible with TCS. The irony is Type R's did not come with a TCS unit but if you plug this modulator into an NSX with a working TCS unit it functions which could mean R modulators contain similar internals as the "H" serials above but were adjusted for more aggressive driving/brake bias.
Note: It's important when searching for this part to know that the number on the ABS modulator housing sticker, 57105SL0 N10, is not the part number even though it looks like one and is not in the Acura/Honda database. You may still, however, get some hits searching by that as the seller might only have this number to go off of when listing it for sale as the box (which has the red/white actual part# sticker on it) is probably long gone. If the plastic housing sticker also happens to be missing/removed/illegible you have nothing left to go off of to identify the unit other than the serial number (which is one of the main purposes of this thread). The official Acura/Honda part# for a Type-R modulator is 57110-SL0-N21 and is ONLY on the box (see pics down below).
S2000 00-03 (AP1) part# 57110-S2A-J51
Sticker# (on white label on black plastic housing) 57105S2A J50
Serial# (etched on black housing)
C 2H14 -1669 CO1 (confirmed S2K)
C 3F2O - O5O9 CO1 (confirmed S2K)
C 3FO6 - OO2O CO1 (confirmed S2K)
C 2B11- O288 CO1 (confirmed S2K)
C 3BO7 - O463 CO1 (confirmed S2K by Honcho)
C 3KO2 - OO31 CO1 (confirmed S2K by tskkhera)
D 9FO6 - OO9O DO1 (confirmed S2K)
D 9H18 - OO5O DO1 (confirmed S2K)
D 9H29 - O3O? DO1 (unconfirmed S2K)
D 9N16 - O258 DO1 (confirmed S2K)
D 9H29 - O3O4 DO1 (confirmed S2K by mogoraug39)
K 1C14 - O676 KO1 (confirmed S2K by Hirose1117)
*Current assumption:
- Any serial# beginning with "C" "D" or "K" is an S2K ABS modulator that will work on an NSX but is not compatible with TCS.
OTHERS (look like it but aren't)
A 1A25 - O574 AO1 (unknown)
AA 3BO7 - 1O49 AA1 (confirmed 03-04 RSX by i am-motors) *note how close this is to an NSX-R serial
B 9NO9 - OO4O BO1 (unknown)
E 9VO9 - OO4O EO1 (confirmed Honda Insight ZE1)
U ???? - 2O19 UO1 (confirmed Honda Stream, confirmed by Kozuchowski)
*Current assumption: any serial# beginning with a "A" "B" "E" or "U" is not compatible with NSX nor TCS ... i.e. do not buy even though it looks like an NSX ABS.
"?" in serial #'s indicates unable to make out the #'s as they are thinly etched onto the plastic housing and the lighting has to be just right
Example 1 - at the time of this posting, there's a late model ABS listing on ebay [LINK] titled as an NSX ABS with serial K 1C14-0676 KO1. I reached out to the seller and the part# is not available and the sticker removed. After specifically inquiring I was also told that "the TCS has been disabled" on this unit. I reached out to the seller again and asked specifically if he would tell me where this unit came from and he informed me it's from an S2000 in Japan and have updated the data list above. It is unfortunate that the listing title is misleading.
Example 2 - at the time of this posting, there's a late model NSX/S2000 ABS listing on Yahoo Japan [LINK] with the serial C 2B11 - O288 CO1. The "C" serial prefix belongs to S2K's and in this case the black plastic housing sticker 57105S2A J50 confirms that. Therefore purchasing this unit, while compatible, will result in no TCS functionality and is not an NSX modulator even though it's listed as one in the title.
Example Serial # D 9N16 - O258 DO1
Example of NSX-R ABS Modulator markings
Serial# (this example starts with AU 3F18 OO11 LOAAA)
Box sticker# (note: this is also the part# in the Acura/Honda database)
Housing sticker# (note: this is not the part number even though it looks like one and does not show up in the Acura/Honda database but still is a valuable authentication indicator if present)
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