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Discovery I Discuss here about the first version of Land Rover Discovery (Disco I) in this section.

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Old 06-26-2011, 08:19 PM   #1
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Default oxygen sensor source

I am changing out all of the oxygen sensors on my 97 Disco. I see that Rovers North has them at $100 each but other sources have them at $25. Are they all the same or should I go with the source I know?
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Old 06-26-2011, 08:25 PM   #2
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I haven't priced them in a while, but figure on the $100 ones... the ones for $25 will require some fancy soldering work and may not fit. The Rover has a very small O2 sensor and sadly can't be bought just anywhere.

Remember you need 4 of them and to make sure you get the correct one for your 97.

It depends on if you have the advance evap setup or not. Based on VIN #
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When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.

Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).
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Old 06-30-2011, 12:47 AM   #3
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Thanks Joey, I don't know what I was looking at but the cheap sensors didn't existing anyway. Funny I changed the front sensors about 8 years ago and have been getting a check engine light when it heated up ever since. I wonder if that will go away when I know I put the correct oxygen sensors on.
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Old 10-03-2012, 02:50 PM   #4
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How do you know when to replace them? I have a 98 with 118k. It seems to run fine but doesn't go up hills on the highway very well. It accelerates good on the level but the grades it just bogs down and has a hard time going over 55 or 60. Like I said, it will speed away from a stop light with plenty of power... drives up to 75 or more on the level. Those hills kill it. With the specs on the V8, shouldn't be.

I wonder if it's O2 sensors, clogged cats, worn cam, MAF... looking for clues. Thanks
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