My father called asking about a car issue with a CEL. We read the codes and found an error P0135, little bit of googling later and I realized I needed to replace the O2 sensor. Found a DIY article, made a trip to Oreilly's and got the wrenches out.
Several grueling hours later the sensor came out (the harness is in an atrocious spot). I then replaced it with a Bosch 13441 O2 sensor (http://www.oreillyauto.com/site/c/detail/BOS0/13441.oap?ck=Search_13441_-1_-1&keyword=13441) and put everything back together. Cleared the CEL and gave the vehicle back.
A few days later the CEL kicks back on. I haven't opened the car back up yet.
What could be causing this? I checked the wiring for the bosch sensor online and it should be an OEM fit, no wiring modifications necessary. I also tried to find any other issues but came up dry. Most immediately it seems that I could have gotten a botched Bosch (see my pun there?) or there is a short somewhere. Before I begin opening things up again, I wanted to see if anyone had any experience with this issue.
