DTC 0707
Diagnostic Trouble Code 0707 points to a problem with the Rear Heated Oxygen Sensor. This sensor is mounted in the exhaust stream, just downstream of the Three-Way Catalytic Converter. When the two Front Heated Oxygen Sensors are operating properly the Rear Heated Oxygen Sensor is not used for engine control operation. It is used to monitor the condition of the Catalytic Converter. If either (or both) Front Sensors fail, the Engine Control Module uses the signal from the Rear Sensor to maintain a correct fuel/air mixture.

DTC 0707 is detected when the Engine Control Module determines that the response time of the Rear Heated Oxygen Sensor is excessive. The possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted.)
- Rear Heated Oxygen Sensor
- Fuel pressure
- Fuel injectors
- Intake air leaks

Please check the condition of the wiring and connector at the rear Oxygen Sensor. If they look okay, you ought to replace the sensor. If you had a problem with fuel mixture I think you would have other DTCs in addition to 0707.

Your Maxima has three Oxygen Sensors. Two are front sensors, mounted in
the Y-pipe between the exhaust manifolds and the Catalytic Converter. One
is a rear sensor, mounted in the exhaust pipe downstream of the Cat.

When both front Oxygen Sensors are operating normally the rear sensor serves only to keep tabs on the Catalytic Converter. That's the reason your engine is running well. The Engine Control Module (the computer) is not using the signal from the rear sensor to control engine management functions.

For more information about Oxygen Sensors go to
http://www.volksparts.com/o2sensors.htm

For specific information about replacing Oxygen Sensors on your Maxima see
the Chilton manual (page 4-13) or the Haynes manual (page 6-14).

Originally posted by Yellowbrother


so does this mean my two front sensor is not doin it's job or does it mean only my rear sensor is f-ing up or does it mean all 3 is f-ing up?? thanx...

Originally posted by Daniel B. Martin
This says it all, in a nut shell.

DTC 0707 is detected when the Engine Control Module determines that the response time of the Rear Heated Oxygen Sensor is excessive. The possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted.)
- Rear Heated Oxygen Sensor
- Fuel pressure
- Fuel injectors
- Intake air leaks

Originally posted by BRIGBOY
As far as the harness or connectors part goes, would that mean they have deteriorated and are exposed, or what. Thats the only part I have not fully investigated throughout my O2 sensor woes.

Originally posted by Daniel B. Martin
However, my personal preference is to avoid touching the ECM wiring unless absolutely necessary.

Originally posted by Yellowbrother
would it be a good idea to go on the safe side and replace all three o2 sensors???

Originally posted by mzmtg


So you think my chopping mine up to lose the speed limiter may have been a bad idea?