MKL on SLK280 error message OBD03 P175

Hello, I would need your help. My 280 worries me, since yesterday the MKL has been answering again and again. If I read out the error (see appendix) and delete it, it runs normally also with MKL no restriction. EZ. 07/07 194000 Km. Suction tube, LMM, 4 camshaft adjusters are new. It would be great if you gave me information about the error codes. M272 V6 Ottomotor engine number starts with 61xxxx Thank you in advance