Got CEL light on the next trip after 400KM run.

Showing 8(HFM)-B17 - intermittent Intake Air Temp Sensor
Code erased. CEL still on.

This is W124, E320 non ASR, 16x connector,
2 - button + LED light installed

Whats is the correct procedure to clean the CEL.
10 sec holding the button is not working, otherwise I missed something.

Cable disconnect battery or ECU - saving as last resort.

Thanks and Regards