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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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Old 11-04-2014, 10:20 PM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Does anyone have any tips for getting at the connectors for the upstream sensors? I just replaced that passenger side and it was a complete pain the a**. I need to do the driver side and it looks as if it's going to be just as tough.

On the passenger side I had to remove the bolt holding the trans fill tube and the wheel well cover to get at the connector, and even then it was extremely difficult to get my hand in there.
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Old 12-17-2014, 06:41 PM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Quote:
Originally Posted by jeepgcoman View Post
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

I just read your long O2 sensor article from 2011. What a wellspring of info. That documentation gives me some confidence to have some meaningful knowledge about just how my newly acquired Hemi works. Many thanks😄


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Old 02-27-2016, 11:03 AM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Can anyone explain SPECIFICALLY how they changed the passenger upstream sensor and removed the connector?

I have the wheel well removed and the connector is behind the transmission dipstick tube. I have the 2006 Laredo 4x4 with 3.7L engine and W5A580 / NAG1 transmission. It's looks like I'm going to have to remove the transmission dipstick tube. There is a bolt at the transmission where the tube and seal are installed. There is a bell housing bolt that holds the tube in place that I can't seem to get an angle on to remove.

Even if I get a ratchet wrench on the bolt there's almost no room in there to turn a wrench. Do I just have to find a way in and loosen one click at a time or is there a better way?
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Old 09-20-2016, 02:20 PM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

Hi, Did you ever finish changing the sensors on the 2006 Laredo? How'd it go? Any advice? thanks
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Old 01-14-2017, 08:24 AM
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Re: Replacing Oxygen Sensors 3.7L V6 WK

I changed both #1s last night on my '08 3.7L. Took me about an hour for the swap. I purchased the NTK/NGK brand sensors. Prior to removal, I sprayed both old sensors with PB Blaster to make removal easier. While I had an O2 socket, I did not use it. All I used was a 7/8 open end/box end wrench to simply loosen the sensors. I only let the PB Blaster sit for a few minutes, but the sensors loosened up rather easily right away. I didn't let them soak for a couple of days. Once loosened, you can hand twist them out. The only "pain" I had was reaching and removing the plugs. The driver side plug was definitely easier to remove than the passenger side, although I didn't have any issues with dip stick tube on mine. I didn't remove the plastic cover under the engine, but I believe doing so would probably have made it just a bit easier, especially to gain access to the passenger side plug.

I'll be swapping out the #2s soon, but those look like they'll be a piece of cake in the end. I'm planning to track my gas mileage in the coming weeks. I have just over 151k on the Jeep, well over when I should've replaced the sensors. I was averaging about 15 mpg, with 50/50 city/highway driving.


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