Hi, I've found the reason: i have an sd Card reader connected to the SPI BUS using pins 50 to 52 and Chip Select pin 53. If I disconnect this SD card Reader, everything works fine. I see that CJ125 SPI communication uses pin 10. The SD SPI communication don't specify any chip select so it should be ...

It is the lambda Shield 2

Good evening,
I use the lambda Shield with an official Arduino Mega.
I use 12V 2A on the arduino DC input and connect lambda Shield using X7 connector.

When i start the sample code I have only CJ125 Error 0xFFFFFF.

Any Idea what's happening?
Thanks for your help.