mjc30458

Hello all:

On the way home tonight, my money hole (otherwise know as a Maxima) put up the orange check engine light. Since I have not put the trim panel back on from the last round of blink counting, I went ahead and pulled the code. 0707 and 0304. So my question is: is it the Cat or the O2 Sensor? The car has 267,000 miles and what looks to be the original Cat and Sensor. Any ideas on how to tell which is the offender?

Any and all comments welcome.

Thanks,
Mike

Kevlo911

iTrader: (36)

0707
Your Maxima engine is OBD-2 compliant. All Diagnostic Trouble Codes are four digits, with the first is always 0 or 1. Therefore your "77" is actually "0707" which points to the rear Oxygen Sensor.

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).

In a different thread SprintMax said he got a great price on a replacement factory Oxygen Sensor from Vester Nissan. He didn't give a location or contact information. Perhaps he was referring to Vester Nissan of Clinton NC, 1-800-572-2005.


http://www.buyoxygensensors.com/