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  #1  
Old April 5th, 2007, 11:41 AM
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mdmccallum
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Mike
'97 Defender 90 SW
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O2 sensors

HOw do I know if my O2 sensors are bad? Is it recommended that they are replaced after so many miles or do they go bad and then you have some symptoms with the performance of the engine? Can I have a diagnostic test done to determine if they are good or not? Sorry but I am clueless when it comes to these o2 sensors.
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  #2  
Old April 5th, 2007, 02:30 PM
MonLand
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The ECU is likely to throw a code if the O2 sensor is bad.
On the newer O2 sensors (like yours), the ECU will also throw a code is the heating element is bad (not as reliable on the older style 3-wire sensors).
The best is to plug a monitor to your OBD-2 plug and watch the sensor output to verify it is switching properly.
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  #3  
Old April 5th, 2007, 10:42 PM
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Andy Radlgruber
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I have a '94 with the older OBD1 sustem and I was told that the service engine light comes on at a pre set amount of Kilometers. It did, and it's purpose is to tell you to replace the 02 sensors. It was around 70 or 80K. That's metric for you south of the border, do the conversion. We also have a code display in the passenger footwell next to the computer that is a dream. Mine was telling me I had a faulty left bank Lambda(02) sensor. The engine ran rich and rough at idle in the summer, very poor fuel economy. Once I changed the sensors it was a new truck. Elvis runs like a top. To make a long story short, don't be cheap about these things. Replace them. They do go sideways on you and you will probably not notice the difference until after you change them. There is a lot of info about how to test them and make sure it is the 02 sensors causing the problem and not something else but you will need some patience to do it. Go to a site like oxygensensors.com and source your parts. Mine were only $105 a piece but I have the three wire jobs.

After all, you own a Land Rover. Don't be cheap and try to save $100. It's a lot easier to just do it.
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  #4  
Old April 5th, 2007, 11:48 PM
MonLand
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Quote:
Originally Posted by andyrad
I have a '94 with the older OBD1 sustem and I was told that the service engine light comes on at a pre set amount of Kilometers.
That's correct the "Service Engine" light is to replace the cats (and O2 sensors while you are at it).
The "Check Engine" light comes on when O2 sensor (or other emission-related problems) are detected by the ECU.

That applies to the OBD-2 (1996+ vehicules) as well.

Follow-up Post:

Quote:
Originally Posted by andyrad
There is a lot of info about how to test them and make sure it is the 02 sensors causing the problem and not something else but you will need some patience to do it. Go to a site like oxygensensors.com and source your parts. Mine were only $105 a piece but I have the three wire jobs.
On the 1997, if you are willing to splice the wires, you can use also a few generic replacement or get some Nissan Altima (year? can't remember) O2 sensors. Last I checked, they were in the $60-$80 range (and that time the stock LR sensors where in the $130 range..... multiply that by 4 as you are "supposed" to replace all of them at the same time because they are supposed to wear evenly, that the difference is worth the effort; wire colors were the same).
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  #5  
Old April 6th, 2007, 01:48 PM
BarryO
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Barry O'Mahony
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I heard the rear sensors on the '97's were jsut to check that the cat's were working, and aren't as important to engine performance as the fronts.
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