143(2) notice

Sir I was recd a notice under section 148 and I have made the reply in this case and after that I was recd a notice under section 142(1)and I this respect I also give the reply accordingly but the A.O. has never issued notice under section 143(2) and made the assessment order in this case.Sir I want to know that can the AO made the assessment order without issuig the notice under section 143(2).Thanks