My daughter has a 1995 Nissan Maxima. She was having trouble with it stalling when coming to a stop. The codes displayed is a P0130 and a P0136 which indicates an upstream and a down stream Oxygen sensor or circuit fault. This vehicle also has a oxygen sensor after the converter. I am thinking about replacing these three sensors myself but I have limited tools and not a real good place to work except out in the yard and in the 90 degree plus heat in the southeastern Pa. I have a 7/8 inch sensor removing socket that I used on my 91 bucik. Hopefully all of the sensors are of the same size...correct me on this if I am wrong. I would like to know if anyone else has done this work before on a Nissan and if so, how hard it is to get to the upstream sensor. They look like they are very close to the firewall. While I am at it I will also check the sensor harness and see if they are clean and tight. By the way, this car has over 90,000 miles on it. I am assuming that the sensors had never been replaced before. I am thinking about buying these Bosch sensors from AutoZone. Is this a good type of sensor?