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Answered 2015-07-16 19:30:20
It takes a special socket that sometimes you can rent from the parts stores. Or you can buy them for about $10.
Buy a specail socket from an auto parts store for O2 sensor. Make sure you upplug the negative battery cable before you take off the sensor. The sensor is easy to get to. Unsrew it and replace it with the new one. Make sure you do not get the new sensor dirty.
You should probably warm up the engine first to allow the exhuast manifold to expand a little and make the thing come out easier. Be carefull not to burn yourself on the hot exhaust! Also, you may want to spread a little anti-seize compound on the threads of the new sensor in case you need to replace it again.
If you still have trouble getting it out (not unusual!), buy a spray can of PB Blaster (best) or Liquid Wrench penetrant at an auto parts store. Spray generously around the threads of the sensor, then lightly tap the base of the sensor to set up vibration, then wait a few minutes before trying again. Do this repeatedly (over several days, if necessary).
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