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Old 05-27-2014, 07:45 AM
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Replacing Oxygen Sensors 3.7L V6 WK

Hi All, Just went through this experience and thought I would put out a few tips from what I learned. I have read many pros and cons about Bosch oxygen sensors so I thought I would give them a try. My WK had 135K miles on it and I felt it was time to change them. I ordered the 4 sensors. Before hand, I sprayed the sensors with Blaster PB to help loosen them. I did this over the course of 3 days. The tools needed are a 7/8 open end wrench for the up-stream (before the cat) and the 7/8 short 02 sensor wrench (off set) for the down-stream (after Cat). While changing I discovered that the Bosch upstream sensors did not fit the connector so I had to order the NKG instead. Getting to the connectors are really the hardest part. For the upstream connectors I found it a little easier to connect the wire before installing the sensor to give you a little more room for your arm. No issues after installing and seems fine with the two types of sensors installed.

Good Luck!
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Old 05-27-2014, 09:48 PM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Just out of curiocity, did you check the O2 sensor voltage with a scanner before and after replacement? I have now 200k Km on the clock and just wondering if i shall replace them soon. I will compare the voltage change with my other (newer) vehicle to see if they became laisy. My mpg is a bit down, so could easily be because of laisy sensors.
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Old 05-28-2014, 04:59 PM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Hi, I did not use a scan tool. Just felt like it was about time to replace them. I know that they are supposed to fluctuate quickly. Good Luck!
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Old 06-18-2014, 11:47 AM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

The O2 Sensors are a lot like spark plugs. They usually wear out slowly and are not noticed until the mileage drops off dramatically. I had my first encounter with O2's after I had custom exhaust headers and system built for my WK, and started monitoring them with my onboard DashHawk. Here's the tread I did after I really started to research sensors. It may, or may not give you some hints on whether it's time to change them or not.

Oxygen Sensors and Their Role in Engine Management--A Primer
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