About 2 or 3 weeks ago I got these codes


0510
Diagnostic Trouble Code 0510 points to a problem with the Rear Heated Oxygen Sensor. This sensor is mounted in the exhaust stream, just downstream of the 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 0510 is detected when the signal from the Rear Heated Oxygen Sensor does not reach the expected maximum voltage threshold value. 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

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.



Then again today, I got the exact same codes!!!
If it was a problem.... would it not go off again right away? Like the next time you drive????
Should I worry?

I also notice that my car has a slow reaction after I slam the pedal down... maybe even 2 seconds.. Then it revs REAL high.
This is my first summer with my maxima, so I have not really punched it yet.
I have done some reading on this form, and I gather the KS (Knoch sensor) would cause something like that? Am I right?
Do you think having a bad knock sensor, which in turn would make the engine rev high would set off those codes? I am pretty sure I was driving like an idiot the first time it went off.
Ideas? Tips? Free money?
Please help

 

No one has any idea????
oh my, this should be fun

 

If you are getting those codes.. the car is telling you those 2 sensors are not functioning properly, meaning you have to change them. I dont think it gets much easier than that. Its the rear 02 in the rear Y pipe and the one in the cat. our cars have 3 02 sensors, one in each bank and one in the rear of the cat.

 

i have 0510 also. so i need to change the rear behingd the cat, plus the rear bank?

 

Is your 99 a Cali Spec or Federal Spec? If it's a Cali Spec, then here's how to fix 0510.

Code 5-10, P0138 downstream O2 sensor RIGHT bank (white insulation color)
BOSCH OEM P/N - 13374 (4 wires with white insulation) is a direct replacement, you can order it online.

0707 might be another code for the same sensor. 0510 says the signal went out of the acceptable range and 0707 says the signal response is too slow. Both point to a rear O2 sensor. So if your a Cali Spec 99, then just replace the O2 and both codes should go away.

 

Get under the car and have a look. To get both codes may suggest that a wire has been broken, maybe due to hitting an object on the road.