See if you can find someone with an Axone 2000, or TuneECU. You need to find out what the error is that the ECU is flagging. If it is a normal error, it will remain in memory until it is cleared by Axone, TuneECU and maybe TuneBoy/TuneEdit.
I had both TuneBoy and TuneEdit - still do - but gave up on them as too unreliable. Maybe I wasn't using them properly, but that's no excuse. Properly designed software should be easy to use. Even Axone 2000 has its quirks, but TuneECU has been most reliable. Its my go-to.