My 1998 Honda Accord has these two codes the replacement sensor is $191.00 at the Honda dealership. They are calling it an O2 sensor located under the hood in the exhaust manifold. I took it out yesterday cleaned it up and made sure the electrical connection was clean and tight. Cleared the codes and they came back on within a couple of seconds. Any suggestions would be greatly appreciated.

PS The engine is the F23A4 and Series is EX-ULEV

Thanks Jon