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OBDLink CX / Re: CX BLE API?
« Last post by STN-Brian on December 05, 2025, 03:24:15 pm »To change the header use the ATSH command:
ATSH 6F1
ATSH 6F1
Recent Posts
2
OBDLink EX / Re: DTC modules not showing codes
« Last post by Joe Repic on December 04, 2025, 10:45:35 am »I was suprised that there are no some kind of codes in relation to "Lpw Tier Pressure" I just top it up and drove the truck for few kilometers and fault resets its self.
Regards
Joe
Regards
Joe
3
OBDLink CX / Re: CX BLE API?
« Last post by kuhlejai on December 03, 2025, 10:26:36 pm »Edit: I got it working for standard OBD-II PID requests. The issue was the Bluetooth library I was using in Arduino.
What I can't currently figure out is how to change the header ID (or default functional CAN ID) for service requests from 0x7DF to the one required for BMW enhanced PID requests on 0x6F1. Is this possible? Does the OBDLink CX support ISO 15765-2 (ISO-TP) extended addressing for manufacturer-specific (0x22) service requests?
Basically my app currently datalogs PT-CAN Bus channels that I know of and GPS from my Race Box Mini. I am hopping to add in OBD Enhanced PID's, I am coding in Arduino (C++). When I try sending the 0x22 service requests I get no response, I think i need to use 0x6F1 CAN ID specifically.
What I can't currently figure out is how to change the header ID (or default functional CAN ID) for service requests from 0x7DF to the one required for BMW enhanced PID requests on 0x6F1. Is this possible? Does the OBDLink CX support ISO 15765-2 (ISO-TP) extended addressing for manufacturer-specific (0x22) service requests?
Basically my app currently datalogs PT-CAN Bus channels that I know of and GPS from my Race Box Mini. I am hopping to add in OBD Enhanced PID's, I am coding in Arduino (C++). When I try sending the 0x22 service requests I get no response, I think i need to use 0x6F1 CAN ID specifically.
4
OBDLink CX / Re: CX BLE API?
« Last post by STN-Brian on December 02, 2025, 01:00:06 pm »Can you tell us a little more about your project?
What language are you using?
Are you getting any error messages?
Did you implement a custom UART driver based on the example provided?
What language are you using?
Are you getting any error messages?
Did you implement a custom UART driver based on the example provided?
5
OBDLink EX / Re: DTC modules not showing codes
« Last post by Shawnf350 on November 30, 2025, 07:15:21 pm »If all of the tire pressures are showing, there shouldn't be any codes.
Are you seeing all four tire pressures, or is one missing when you see the diagram of the vehicle?
I can load up my Forscan tomorrow on my Ford truck and see what I can view Monday.
Or I'll ask my son. He's a tech at a Ford dealership.
If you like, PM me after this.
Regards,
Shawn
Are you seeing all four tire pressures, or is one missing when you see the diagram of the vehicle?
I can load up my Forscan tomorrow on my Ford truck and see what I can view Monday.
Or I'll ask my son. He's a tech at a Ford dealership.
If you like, PM me after this.
Regards,
Shawn
6
OBDLink EX / Re: DTC modules not showing codes
« Last post by Joe Repic on November 30, 2025, 06:56:30 pm »Shawn, thank you so much for a quick response. So you are saying that there are no codes for low tier pressure to be viwed by FORscan softwere.
To answer you question yes there ia a message in the cluster. Is there any way to find out which sensor is bad.
Regards
Joe
To answer you question yes there ia a message in the cluster. Is there any way to find out which sensor is bad.
Regards
Joe
7
OBDLink EX / Re: DTC modules not showing codes
« Last post by Shawnf350 on November 30, 2025, 06:06:17 pm »Joe. Is your instrument cluster showing that the tire pressures are low?
If you've aired the tires to the proper PSI, it will take some driving time before the low pressure warning clears.
It's not a trouble code in the system. It's functioning as it should.
If any of the tires show dash marks, it's a sign that one of your TPMS sensors is bad on one of your wheels. You may then show a code for which one isn't responding.
Kind regards,
Shawn
If you've aired the tires to the proper PSI, it will take some driving time before the low pressure warning clears.
It's not a trouble code in the system. It's functioning as it should.
If any of the tires show dash marks, it's a sign that one of your TPMS sensors is bad on one of your wheels. You may then show a code for which one isn't responding.
Kind regards,
Shawn
8
OBDLink EX / DTC modules not showing codes
« Last post by Joe Repic on November 30, 2025, 04:44:33 pm »Hi everyone, I am new to this forum hopefully this post is in wright place.
1. Have F150 3.5 ecoboost turbocharged. Installed FORScan for Windows v2.3.68
2. Installed FORscan software for Windows, and bought OBDLink EX.
3. All communications working I assume. Green light is on the adaptor.
4. All modules are downloaded and have green check mark.
When I go to DTC modules do appear without any fault codes. At the moment I do have "Tier Pressure Low" message. I thin I should be visible under TPM module but its not. If I don't se it how can I reset it.
Your help is much appreciated.
Regards
Joe
1. Have F150 3.5 ecoboost turbocharged. Installed FORScan for Windows v2.3.68
2. Installed FORscan software for Windows, and bought OBDLink EX.
3. All communications working I assume. Green light is on the adaptor.
4. All modules are downloaded and have green check mark.
When I go to DTC modules do appear without any fault codes. At the moment I do have "Tier Pressure Low" message. I thin I should be visible under TPM module but its not. If I don't se it how can I reset it.
Your help is much appreciated.
Regards
Joe
9
OBDLink CX / Re: CX BLE API?
« Last post by kuhlejai on November 30, 2025, 02:00:26 pm »Greetings all,
The OBDLink CX works great with the existing IOS/Android apps, but I would like to spin some tools of my own (perhaps a simple ESP32 on my dash with some live vehicle stats).
Since this adapter uses BLE, I understand there isn't a standard Bluetooth Serial Port Profile for third party / open source software to utilize. However, I do see that there are a few third-party apps that support the OBDLink CX, such as "Carista" or "Harry's Lap Timer" as listed here: https://www.obdlink.com/compatible-apps/ which does imply that third parties know (to some extent) how to interface with this thing!
So really my question; is there documentation posted somewhere on the BLE API for the OBDLink CX? Or am I stranded, having to attempt reverse-engineering the protocol myself?
Has anyone figured this out, I can’t get my esp32 to connect or discover the OBDLink cx despite reading the tech article. So I can’t even get my app started… Any help would be appreciated.
10
OBDLink MX+ / Re: ODBLink MX Tool - Honda Support - Throttle Body Relearn
« Last post by Shawnf350 on November 30, 2025, 05:39:50 am »The MX+ is only capable of reading Honda Mfr specific codes with the ObdLink app.
Their may be a program available if you search the net, but I'm not aware of any.
Kind regards,
Shawn
Their may be a program available if you search the net, but I'm not aware of any.
Kind regards,
Shawn