Hello
First time posting here.
I have an 03 outlander that the SIL came on. I had the ODBII scan done and it said that the o2 sensor had gone bad but I did not know if it was the front or the back one so I replaced both. Well I disconnected the battery while I made the change and when plugged back in and turned on the car the light was off but the car still did not run right at first. After about 30 min of driving the car it started running better. But when I turned it on again the next day the light was on again. The ODBII scan now showed three errors with the O2 sensor having to do with no activity detected and also low voltage. I replaced the front O2 sensor again but that did not help. I reAd that it could be the connectors in the engine bay but I don't know where they are. Can someone tell me where these locations are?

Thank you in advance.