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Old 08-01-2011, 09:25 AM   #1 (permalink)
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Default Oxygen sensor replacement?

Is replacing the sensors an easy job or is it something I should take to a mechanic to do? If i can do it, where should I start?
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Old 08-01-2011, 01:12 PM   #2 (permalink)
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its easy enough...youll get dirty..but its not that bad... For the sensors that are pre cat they are easier to unplug if you go through the engine bay but then unscrew them from underneath the car... the post cat ones are super easy to get to and replace. I did it in 30 minutes in the dark so its not bad at all. you can get the sensors at your local autoparts store..i think they are BOSCH. they get pricey if you are going to do all of them so make sure you know which ones are actually broken as to save money.
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Old 08-01-2011, 01:31 PM   #3 (permalink)
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Unplugging those front sensors really suck, I think it is easier to remove the engine than unplug those suckers.
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Old 08-01-2011, 01:34 PM   #4 (permalink)
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Why are you replacing them, do you have fault codes, are you replacing all 4, how many miles on your truck?
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Old 08-01-2011, 05:13 PM   #5 (permalink)
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Some helpful hints: 1. Don't go half-assed on the sensors. Pay a little more and get OEM from AB for instance. D2's are sensitive to cheapies. 2. If you replace one, make sure you replace it's opposite. If you can swing it, replace all four. 3. To get the old ones out, soak them in penetrant the night before, cut the wire and get a box end on them to avoid stripping the nut. 4. There is a trick to the plug. If you just pull on it, it will not come unplugged. The entire plug assembly (both sides connected) is attached to the vehicle via small metal tabs. You must first remove the connected plugs from this metal tab and then the connectors will come apart.
- Bill
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Old 08-01-2011, 10:50 PM   #6 (permalink)
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What's the reason for wanting to replace the O2 sensors?
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Old 08-02-2011, 05:55 PM   #7 (permalink)
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I was told that the rear ones are bad by a mechanic, but I wanted to replace them myself. And My Disco has 125,000 miles, thanx for the advice helievacpilot. Do you suggest anything else Disco Mike?
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Old 08-02-2011, 06:23 PM   #8 (permalink)
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Default where do i find the rear sensors???

where are the rear sensors exactly???
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Old 08-04-2011, 04:58 AM   #9 (permalink)
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Quote:
Originally Posted by LeninG. View Post
where are the rear sensors exactly???
They're located after the CAT's on top of the pipes.
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Old 08-04-2011, 10:09 AM   #10 (permalink)
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Just did this myself. Go to Autozone/Advance to get the codes read to make sure you are doing the right thing (if you don't have a code reader yourself). If your rear sensors are shot then you'll get codes saying there are faults with 'bank 1 sensor 2' and 'bank 2 sensor 2'. You didn't mention if you had a SES light lit.

Replacement is SUPER easy - even for beginners. The truck sits nice and high so you don't even need jacks or anything. Follow the exhaust headers as they leave both cylinder banks, the headers will then converge into 1 pipe and then feed into catalytic converters (look like small mufflers), directly after the catalytic converter you'll notice 2 sensors on TOP of the exhaust pipes (1 in each). Follow the wires coming off of the top of the sensors and they'll lead you to the plugs somewhere above the exhaust pipes and frame rails. CAREFULLY unclip the plugs - do NOT force it, you risk messing up the wiring if pins come loose from the plugs, it should come out easily. Then simply take a wrench and carefully remove and replace the sensors. Even the most inexperienced mechanic shouldn't take more than 1 hour to do this. I finished in about 15 minutes per side.

OEM is BOSCH and please for your sake do use them. Someone had replaced my pass. rear sensor with some cheapie piece of crap which was probably dead from the very start.

Let us know if you need more help.
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Old 08-04-2011, 01:43 PM   #11 (permalink)
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Default Thanks for all the support!

Im not getting any SES lights on but an independent landrover mechanic told me that the rear ones are out so i figured I replace them myself. Thanks for all your support guys!!!!!!!!!!!!!!
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