Diagnosis doesnt work any more after disconnecting Battery for about 1 Month

[66rubberduck]

Diagnosis doesnt work any more after disconnecting Battery for about 1 Month. All other functions like showing Temperatures, Speed , Boostpressure works. Only when i change to Diagnosis at every Item i get the Message timeout.

[autopilot]

Time does not matter.
Any other diagnostic equipment present in the diagnostic connector ?

[66rubberduck]

If i connect the VCDS Cable on the Diagnosis Plug i can readout all Messages, only the MFA show timeout.

[autopilot]

Need to look for a problem. Disconnect the K-line from the ColorMFA to the cluster, check the connection with the cluster through the VCDS. Check ColorMFA K-line connections. Soldering problems, short circuits, etc.