How do I retrieve the correct mileage on 1996 850

850Rick · Post by **850Rick** » 30 Aug 2020, 13:47

How did you reset your odometer?

850Rick · Post by **850Rick** » 30 Aug 2020, 13:47

bankrum wrote: ↑07 Dec 2018, 12:21 Thanks to Mashmash and the posted tip for purchasing the BAFX bluetooth OBD reader and 850 OBD-II android app, I too have retrieved the true miles for my 1996 850 and subsequently repaired the odometer and reset it to true miles. This was a great tip.

During the odometer repair process, I found that the small plastic gear was NOT broken. Rather, it was simply "stuck" or frozen on its shaft. I replaced both gears nonetheless and it is now working like new.

Thanks again to Mashmash!

How did you reset your odometer?

Post by **erikv11** » 30 Aug 2020, 20:31

You can use a pencil with eraser hooked onto a drill e.g. Others have forced the gears to the right place but I don't recommend that.

Post by **mecheng** » 15 Sep 2020, 08:41

Does VOL FCR show the odometer on a 97, I can’t
Find it listed?

Rometsch · Post by **Rometsch** » 26 Dec 2025, 14:21

OK - I've looked everywhere and this seems the best place to ask. I have replaced my odometer gears and am trying to reset the mechanical wheels to the actual mileage. I bought an EPROM reader to download the 93S56 memory contents from the instrument cluster which should contain the actual mileage info, and now have the HEX info. I thought I had heard that you could then decode the HEX and get the mileage. I understand that there are shady characters out there that could manipulate this data to their advantage, so because of that I can't find the location and how to decode this HEX dump. Is there someone or a service who can decode it for me so I can reset my odometer? I don't need to know the actual EPROM data location, I just would like to know the decoded mileage. I can send the HEX dump to you...

Thanks,
Mark

Post by **gmh** » 26 Dec 2025, 18:15

Rometsch wrote: ↑26 Dec 2025, 14:21 OK - I've looked everywhere and this seems the best place to ask. I have replaced my odometer gears and am trying to reset the mechanical wheels to the actual mileage. I bought an EPROM reader to download the 93S56 memory contents from the instrument cluster which should contain the actual mileage info, and now have the HEX info. I thought I had heard that you could then decode the HEX and get the mileage. I understand that there are shady characters out there that could manipulate this data to their advantage, so because of that I can't find the location and how to decode this HEX dump. Is there someone or a service who can decode it for me so I can reset my odometer? I don't need to know the actual EPROM data location, I just would like to know the decoded mileage. I can send the HEX dump to you...

Thanks,
Mark

Hi Mark,
While I don't know if the data you got from the EPROM reader will compare to the way I got mine from the cluster, check out this old thread viewtopic.php?t=61976 . My post (4th from the top) tells you how to decode HEX (base 16) as well as which numbers to use. Good luck.

454cid · Post by **454cid** » 26 Dec 2025, 19:24

Get a bluetooth obd2 dongle, and the obd850 app. It'll give you the mileage to the nearest 10 miles (no idea why it doesn't do the one's digit).

Post by **abscate** » 27 Dec 2025, 02:49

454cid wrote: ↑26 Dec 2025, 19:24 Get a bluetooth obd2 dongle, and the obd850 app. It'll give you the mileage to the nearest 10 miles (no idea why it doesn't do the one's digit).

They were a bit short of data , Shirley.

Rometsch · Post by **Rometsch** » 29 Dec 2025, 18:16

Thanks VERY MUCH for the links - I tried this and got this result...

Any ideas?

[17:07:09] ATZ > ELM327 v1.5
[17:07:18] ATL1 > Request timeout or failure
[17:07:23] ATL1 > ATL1OK
[17:07:30] ATE1 > 010041 00 80 00 00 00 41 00 BE 1D B0 00
[17:07:35] ATH1 > Request timeout or failure
[17:07:40] ATH1 > ATH1OK
[17:07:45] ATAL > ATALOK
[17:07:51] ATKW0 > 010048 6B 1F 41 00 80 00 00 00 93 48 6B 17 41 00 BE 1D B0 00 96
[17:07:59] ATTA 13 > ATTA 13OK
[17:08:09] ATII1 51 > ATII1 51
[17:08:33] ATWM 82 51 13 A1 > ATWM 82 51 13 A1OK
[17:08:42] ATSI > ATSIBUS INIT: ...OK
[17:08:54] ATSH 84 51 13 > ATSH 84 51 13OK
[17:09:01] B90300 > Request timeout or failure

Post by **gmh** » 29 Dec 2025, 18:48

Rometsch wrote: ↑29 Dec 2025, 18:16 Thanks VERY MUCH for the links - I tried this and got this result... Any ideas?

[17:07:09] ATZ > ELM327 v1.5
[17:07:18] ATL1 > Request timeout or failure
[17:07:23] ATL1 > ATL1OK
[17:07:30] ATE1 > 010041 00 80 00 00 00 41 00 BE 1D B0 00
[17:07:35] ATH1 > Request timeout or failure
[17:07:40] ATH1 > ATH1OK
[17:07:45] ATAL > ATALOK
[17:07:51] ATKW0 > 010048 6B 1F 41 00 80 00 00 00 93 48 6B 17 41 00 BE 1D B0 00 96
[17:07:59] ATTA 13 > ATTA 13OK
[17:08:09] ATII1 51 > ATII1 51
[17:08:33] ATWM 82 51 13 A1 > ATWM 82 51 13 A1OK
[17:08:42] ATSI > ATSIBUS INIT: ...OK
[17:08:54] ATSH 84 51 13 > ATSH 84 51 13OK
[17:09:01] B90300 > Request timeout or failure

It looks like you should have repeated the B90300 command when you got the "Request timeout or failure" response as you did earlier in the string with ATL1 and ATH1. The response to that command should contain the mileage data.

How do I retrieve the correct mileage on 1996 850

Re: How do I retrieve the correct mileage on 1996 850