Hi folks. I bought a used 2014 Civic LX as a new commuter car. It's a great little car. When I bought it, it had a P0138 code, hi voltage on bank 1, sensor2. I replaced the sensor with a cheap Walker sensor that was on clearance at Rockauto. I cleared the code and a few hundred miles later, I get a code P0139, slow response on the same sensor. I'm guessing it's because I bought a cheap sensor. Does that sound right or should I look at something else? Has anyone had success with any aftermarket sensors? Thanks.