I had a CEL, and checked the codes.....one was the knock sensor, 03 04, and another was 05 10. I checked the codes on http://vbxmaxima.8m.com/ecudecoder.html, and the last one was undefined. Has anyone experienced this before? I checked out the stickies on the Knock Sensor replacement......

 

Dude, check the stickies.

http://forums.maxima.org/showthread.php?t=104931

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

 

Simple...Get a new O2 sensor. Reset the codes. Next your Coils will go bad.
Look for Multiple Misfires.

Just my .02

 

Hey it's been a while but, instead of getting coil packs cuz there arm and a leg I remember replacing couple way back.. but, did anyone find a way to convert them to MSD??