Air bag /SRS light on Mercedes S class W220 2004 Model

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Mercedes S class W220 2004 Model​

Passenger seat air bag ( child seat safety ) triggered fault brought on air bag light!
Tried the kit from eBay re: bypass module plug in.
Worked for a couple of weeks..then fault reappeared!
Thought I had it now fixed perfectly by my mechanic who actually disabling the front seat sensor from memory,
That again worked a short time ..but light back on!
Help

 

[tich]

UPDATE.... Replaced passenger side air bag ..bought used from ebay.
Got faults cleared..so far all good.