Mike Cline

On my way to work this morning my check engine light came on. She still runs as good as usual. Anyone ever had this problem? Thanks in advance for any help guys.

SonnQ

I had this problem on my Maxima a couple years ago. Turned out to be the rear oxygen sensor. Took it to a non-dealer repair shop in town. Came out to about $150 with parts and labor.

By the way...I think you and I have the exact same Maxima (95 GLE, Ruby, Black leather). Cool.

-Sonny

blizz20oma

iTrader: (1)

I thought an O2 sensor would be more than that to replace.
But yea...if the car hasn't gotten it replaced, it seems to me by observation and research that the rear O2 sensor is a pretty common issue with the G4s.

Sonic

You can diagnose what is wrong by testing the ECU. The instructions are here. http://vbxmaxima.8m.com/ecu.html. If you still need help, come back with the error codes.

Mike Cline

I tried the page you requested for the ECU, but the publisher said the page was not available. Wonder what the problem is?

NickStam

iTrader: (3)

http://vbxmaxima.8m.com/ecu.html


Click on this one.

Mike Cline

That's it. Thanks man.

Sonic

Oops, the stupid period was in the way. Sorry.

Kevlo911

iTrader: (36)

after u get the codes look in the sticky ant the top of the forum

Mike Cline

Wouldn't happen to know anything about the engine coolant temperature sensor? Thanx

Sonic

I could, what do you need to know?

Mike Cline

How much does it cost to have a dealer replace it and will it damage anything to drive my max till I get it fixed and also can I replace it myself. Thanx

Daniel B. Martin

You may want to test your Engine Coolant Temperature Sensor. This is easy enough, requiring only an ohmmeter.

On the 4th Generation Maxima engine the Engine Coolant Temperature Sensor is located in the water outlet tube close to the engine end of the upper radiator hose. There are two sensors in that area. The one nearest the hose is for the dashboard temperature gauge. The ECTS, the one you're interested in, is right next to the the gauge sending unit. There is a good picture of these sensors in the Haynes repair manual on page 3-7.

With the engine cold, disconnect the ECTS and measure its resistance.
Reconnect the ECTS, start the engine, run it until fully warmed up. Stop
the engine, and repeat the resistance measurement. The "warm" reading
should be a much lower value than the "cold" reading.

The manual gives these specs:
Engine coolant temperature 68F, ECTS resistance 2.1 - 2.9 Kohms
Engine coolant temperature 194F, ECTS resistance 0.24 - 0.26 Kohms
(Roughly a factor of ten difference.)

Sonic

1.)Try to reset the ECU and see if it goes out by itself.
2.)If it comes back on then replace or check, its probably easier to change out though. The sensor is located at the beginning of the coolant outlet hose on the rear of the front cylinder bank. You can do this yourself, with a working knowledge of your car. The Nissan part number is 2263044B20 and the list price is $24.09. The dealer can do this in about 15 minutes, but you will still get chaged the hour rate, which is in the neighborhood of 70 bucks. Is it okay to drive with it on? Don't know off hand.