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Where is the O2 sensor. Bank1 Sensor1. I know it's pre-cat, i'm assuming driver side. Manual lists it as being under the motor but that's not correct. Is this tough to get to and test and change? At $75. I want to be sure it needs to be changed. I'm still trying to track down the source of a vibration on idle that might be coming from a slightly irregular idle.
 

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Should be drivers side upstream on the exhaust. it is not the rear 02 but the one found before the first converter.

it is easy to change, I changed mine and you can get the Bosch ones for a decent price at autozone and they can rent you for free the 02 sensor socket to get them off. I do not know the price as i work in the auto field and I get cost price being I work for a dealership.
 

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Yeah that sounds right. The O2 sensor socket IS nice to have, but not required to get them out though. A closed end wrench works really well too.
 
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