Howdy y'all, I recently got a check engine light for code p0137 ("O2 Sensor Circuit Low Voltage Bank 1, Sensor 2)". I just replaced the downstream o2 sensor through the wheel well (99% sure that's the correct one but the information has differed), started the car up and let it run for a bit and the code was still on. I haven't get the chance to drive it yet but plan on it tomorrow to see if that'll clear it but if not I'm wondering what else it might be. All cables and connections looked good while I was under the car, could be a vacuum leak maybe? Was wondering if anyone else has been through this before and could fill me in. Thanks!