PeteGT2857

Hey
Trouble code 0707.

Points to Rear Oxygen Sensor? Check harnesses right? What would be the troubleshooting process on this? At waht point do i replace the actualy sensor. Could it be something major.

Pete

Daniel B. Martin

There is a wealth of information in the Sticky titled ECU Diagnostic Trouble Codes. Go there and read all about it.

PeteGT2857

I went there but i'm still not sure. I will do waht it says, to check the wiring and the harnesses. But how hard is it to do that? I've Had an escort GT b4 and It ndidn't have an oxygen sensor. Is it right after my cat? Could i put it on Jack stands and look for it?


thanks I'm just learning about this stuff.

Pete

Daniel B. Martin

This diagnostic work may be successfully performed by the novice home mechanic.

Yes.

Yes.

You really should have a manual. Chilton and Haynes repair manuals are available. Haynes is the better of the two for most purposes. For a detailed comparison of manuals, see http://vbxmaxima.8m.com/manualcompare.html

levine

hey i got the same error when i tested to see why my engine light was on, (0707) where do i get the sticky titled ecu diagnostic trouble codes, all i know is that its a rear 02 sensor and when i reset the computer thingy under the gas pedal it did not come back on,
did i fix it or turn it off???
thanks
jesse

PeteGT2857

i was going to get the service Tech manual from Nissan on Friday. I firmly believe in owning the manufacturer's manual, even though it's 103 dollars. But hey gotta do it. Couple things more and I'll be done.

1.) What should i look for?

2.) Is it just a screw out kinda thing if needed replaced?

3.) Could it possibly becase by running it hard and needing to cool down?

I'm done I promise Dan, Thanks for the help though

Daniel B. Martin

I think you will want Chilton or Haynes in addition to the factory service manual. The aftermarket books have lots of valuable pictures. I have all three books and usually reach for Haynes first.

The heated Oxygen Sensors have two components: a heating element and a sensing element. The heating element may be tested with an ordinary ohmmeter. This test is done with the engine off.

Follow the wires away from the Oxygen Sensor until you find the nearest electrical connector. Disconnect the connector. Viewed with the connector latch at the 12 o'clock position, there are three terminals. They are numbered 1-3, right to left. Be sure to measure the terminals in the connector half which is attached to the Oxygen Sensor, not the one which leads to the Engine Control Unit.

Measure the resistance between terminals 1 and 3.
The factory spec is 2.3-4.3 ohms at 77 degrees Fahrenheit.

Measure the resistance between terminals 1 and 2.
The reading should be infinity (no connection).

Measure the resistance between terminals 2 and 3.
The reading should be infinity (no connection).


The sensing element of an Oxygen Sensor cannot be tested with an ordinary ohmmeter, but it may be tested with a special-purpose tester or an automotive oscilloscope.

The signal from a healthy sensor varies from a low threshold (around 0.2 volts) to a high threshold (around 0.8 volts), and it sweeps back and forth between those extremes about 10 times per second. If a scope trace shows the Oxygen Sensor signal failing to reach either extreme, or oscillating between them at a frequency slower than 10 cycles per second, that is evidence of a "tired" sensor. If your voltmeter is one of the fancy models (Fluke 87, etc.) you may be able to use it in lieu of a scope to make this evaluation.

I've read that a bad Oxygen Sensor can sometimes be rejuvenated by removing it, clamping it in a vise, and heating the sensing tip red hot with a propane torch. This is said to burn off a crust of deposits which interfere with its operation. I've never tried this torch trick myself, so cannot vouch for it's effectiveness. If you have a sensor which is already dead, you have little to lose.

For more information about Oxygen Sensors see:
http://www.volksparts.com/o2sensors.htm
http://members.aol.com/carleyware/library/o2sensor.htm

Yes. That's a simplified view, but yes.

Not likely. An Oxygen Sensor may fail to high mileage or being "poisoned" by exposure to various substances including leaded fuels, anti-freeze, anti-seize, RTV sealants, and the residue of burned engine oil.

Daniel B. Martin

Sticky is the name for the posts which remain at the top of the forum contents page. The Subject line is prefaced with "Sticky:".

The computer thingy is called Engine Control Module. It is located to the right of the gas pedal, not under it.

You turned the Check Engine Light off. You didn't fix anything. If there is something really wrong with that Oxygen Sensor the CEL will come back sooner or later. Probably sooner.