Recent Posts

1

Developer Forum / UDS Service 3E: TesterPresent

« Last post by sillygoose on Yesterday at 04:02:42 pm »

Just wondering how to best implement the tester present feature to minimize the overhead.

If I use 3E00, I get a response:

.testerPresent [3E00 → 7E007E007E007E007E00]

which is a waste of time since the response is not used. If I use 3E80 and suppress positive replies it times out and I het a No DATA response:

.testerPresent [3E80 → NO DATA]

Docs say NO DATA is a timeout, is there a way to prevent the timeout when using the suppress positive replies option?

2

OBDLink LX Bluetooth / Re: OBDLink LX failing to connect

« Last post by Barry on Yesterday at 01:40:47 pm »

I kept removing and reinstalling the adapter. It was showing errors and inability to connect to ECU, even when the adapter showed connection. Finally I was able to get it working and I cleared my faults. I've never used the Emissions Readiness s/DTC readings, but here is what it shows:
Misfire: Complete
Fuel System: Complete
Components: Complete
System Type: Spark
Catalyst: Incomplete
Heated Catalyst: Not avail
Evaporative Sys: Incomplete
Secondary Air Sys: Not avail
A/C Refrigerant: Not avail
O2 Sensor:L Incomplete
O2 Sensor Heater: Incomplete
EGR System: Incomplete

Is my adapter going out, needing to be replaced? What do I do about the incomplete readings on the Emissions Readiness s/DTC?

3

OBDLink LX Bluetooth / OBDLink LX failing to connect

« Last post by Barry on Yesterday at 01:10:32 pm »

I was using my OBDLink LX, and all was fine. Then it stopped working. It says Not connected to ECU -- Connect to ECU first. When I click on that, I see this message: Not connected to OBD interface! Connect then try again. I restarted my Android cellphone and even uninstalled and reinstalled my Torque app and removed and reinstalled my OBDLink LX, but nothing seems to change. What can I do to get this working again?

4

OBDLink MX+ / Re: Should I remove MX+ when vehicle not in use?

« Last post by Shawnf350 on February 25, 2026, 05:22:47 pm »

The tool comes with a 3 year warranty.
I would suggest you put in a ticket and see what they can do for getting a replacement, even if it's exceeded the 3 years.

https://support.scantool.net/support/tickets/new

 Kind regards,
Shawn

5

OBDLink MX+ / Should I remove MX+ when vehicle not in use?

« Last post by rich121 on February 24, 2026, 11:43:01 pm »

I have been using (2) different MX+ scanners for years without issue, one in a 2006 F350 diesel, the other in a 2005 VW Golf TDI and I've left them plugged in to the OBD port.

A short time ago, the oldest MX+ scanner, which was plugged into the F350, is no longer recognized.  I have removed it, plugged it back in, blue light on (flashing) and green light on, but when I try to activate it the phone says the MX+ is not working properly.

I have tried it in both vehicles and get the same messages in both.

Are there issues with leaving the MX+ in the OBD port all the time, or should I remove the MX+ from the port when parked?

6

OBDLink / Re: How are Pitch and Roll calculated?

« Last post by STN-Manny on February 24, 2026, 03:39:11 pm »

In the OBDLink Android app, Pitch and Roll are device-sensor PIDs (i.e., computed from your phone/tablet sensors), not something read from the car and not something coming from the adapter.

7

OBDLink / How are Pitch and Roll calculated?

« Last post by wz2b on February 22, 2026, 08:10:56 am »

Hi all,


I’m collecting some before/after data on body roll prior to doing suspension upgrades on my 2024 WRX. I noticed that OBDLink (Android) exposes software parameters for “Pitch” and “Roll,” and I’m trying to understand how those are calculated.

I’m trying to determine whether these values are stable enough for steady-state cornering analysis, or if I should log raw accel/gyro data and do the fusion myself.

At first glance it seems like you’d just use the phone’s gyros, but that wouldn’t be sufficient by itself since gyros drift over time. To estimate absolute pitch/roll correctly you typically need sensor fusion — combining accelerometer data (gravity vector) with gyro data (angular rate), possibly with some filtering (Kalman/complementary filter, etc.).

So I’m wondering:

Are the Pitch/Roll values computed by the OBDLink app itself?

Or are they coming directly from Android’s orientation APIs?

Is this purely phone-based sensor fusion, or is there any additional hardware involved?

Does OBDLink document how these angles are derived (e.g., filtered accel + gyro fusion, gravity vector estimation, etc.)?

I’m using a Pixel 10, so there’s no external IMU besides what’s in the phone. I assume the values are synthesized from the phone’s x/y/z accelerometer and gyro data, but I’d like to confirm before I base any analysis on them.

Any insight would be appreciated.

8

OBDLink MX+ / Re: Lost activation For windows app

« Last post by Shawnf350 on February 21, 2026, 02:58:38 am »

I've sent you a message as well,
Kind regards,
Shawn

9

OBDLink MX+ / Re: Lost activation For windows app

« Last post by SoulCarCustom on February 21, 2026, 02:34:59 am »

Cart, I've sent you a message.

Shawn

Hi,
Could you help me with this? I got the same issue. I have an new laptop, re-install the software but it asks for an activation code that I didn't get anymore.
Thank you

10

General OBD Questions / Re: Programming 2012 for tow mirror

« Last post by Shawnf350 on February 16, 2026, 05:53:59 pm »

You can try AlfaObd.
https://www.alfaobd.com/

https://www.alfaobd.com/supported_cars.html

There are videos on you tube if your search too.
https://youtu.be/H2jwMda0v3Q?si=mkR2_BzT2HUbEqC_

I would personally purchase the ObdLink MX+.
Then you'll also be able to scan Ram vehicles and many other makes using the OBDLink app
 with free mfr specific add-ons.

The base tool is the OBDLink LX. If your not looking for extra features for the future.

Regards,
Shawn