Creta bs6 pickup problem ,engine light on/lost communication/ fault code U02A300,U000100,P219500

Creta crdi check engine light on and pickup problem. fault code U000100 high speed can communicatoon bus., P219500 o2 sensor signal stuck lean., U02A300 lost communication with PM sensor I check all fues relay , Then check resistance between can line and found the resistance is same after removing ecm couplar.