O2 censors

[My01yuk]

I'm thinking of changing my O2 sensors. I need to know if this is a DIY project or should I have my mechanic do it? I have 140K on the original sensors. I have a slight rough idle. Cleaned my MAF/TB and ran a can of seafoam couple months back. What tools would i need and where are these sensors located in an 01 yukon slt?

 

[gitrduun]

You have 4 o2 sensors. Your forward sensors are just after the manifold as each side comes down the side of the bell housing for the tranny , they are the ones that measure how good your truck is burning, then youll have two behind each of your cats, they measure if you have cats. The back two I wouldn't worry about.

 

[My01yuk]

Thanks J. I appreciate your help.

 

[chip]

The back two O2 sensors are the most important (they do more than check for cats - they measure how well the cats are working). I would replace those first, as they are the most likely to cause your O2 sensor issues.

 

[My01yuk]

I'm just going to replace all 4. Chip, the kon is looking good bro. Have you done anything to it lately? It looks like you have done a mod or two but I can't be certain.

 

[gitrduun]

How are the back ones important? Only if you care about your emissions

 

[chip]

I'm just going to replace all 4. Chip, the kon is looking good bro. Have you done anything to it lately? It looks like you have done a mod or two but I can't be certain.

Thank you Sir! I've done a lot to it, but I also sold it the other day.

 

[My01yuk]

Thank you Sir! I've done a lot to it, but I also sold it the other day.

What! Why? Are you upgrading or just getting out of the SUV game? I'm sure you hated seeing it leave. What are your plans now?

 

[bmlb929]

Hey My01yuk...I have a question...I have never done this before and I have one that just went bad....Bank 1 Sensor 1...any tips you can throw my way?....I just bought a 04 yukon denali with 167,000 miles....the most I have done is brake pads and sparkplugs...not 100 percent sure how to tackle the 02 sensors though....thanks

 

[chip]

What! Why? Are you upgrading or just getting out of the SUV game? I'm sure you hated seeing it leave. What are your plans now?

I had two massive (Grand Mal) seizures, so I can't drive anymore. Imagine how I felt about selling my truck (for only $6K)!

Hey My01yuk...I have a question...I have never done this before and I have one that just went bad....Bank 1 Sensor 1...any tips you can throw my way?....I just bought a 04 yukon denali with 167,000 miles....the most I have done is brake pads and sparkplugs...not 100 percent sure how to tackle the 02 sensors though....thanks

What's your question?

 

[Physh1]

The back two O2 sensors are the most important (they do more than check for cats - they measure how well the cats are working). I would replace those first, as they are the most likely to cause your O2 sensor issues.

Nope...they are there to check for catalytic efficiency. The pre cat sensors regulate air/fuel mix & tuning. All 4 are important if you have cats and the pre cat ones do more work keeping air/fuel correct.

Cameron

 

[bmlb929]

Sorry to hear about your seizrures. It looks like a straight forward repair but it seems when I think that something comes up and I end up making it a bigger job than it should be. I found the sensor and I just wanted to see if anyone had tips on making it as simple as possible.

 

[chip]

Nope...they are there to check for catalytic efficiency. The pre cat sensors regulate air/fuel mix & tuning. All 4 are important if you have cats and the pre cat ones do more work keeping air/fuel correct.

Cameron

Good point! I was thinking in terms of monitoring cat efficiency. Sorry about that OP.

Sorry to hear about your seizrures. It looks like a straight forward repair but it seems when I think that something comes up and I end up making it a bigger job than it should be. I found the sensor and I just wanted to see if anyone had tips on making it as simple as possible.

See above (and thanks).

 

[03Dnasty]

This past week my Check Engine Light came on for a bad upstream sensor which ARE the two most important. I did notice my truck was starting to run a little rough sitting at idle a week or so before the light came on. Can't wait to see if I can get a couple more MPG's after changing them out!

 

[chip]

This past week my Check Engine Light came on for a bad upstream sensor which ARE the two most important. I did notice my truck was starting to run a little rough sitting at idle a week or so before the light came on. Can't wait to see if I can get a couple more MPG's after changing them out!

Could you not read my last post?

 

[My01yuk]

I had two massive (Grand Mal) seizures, so I can't drive anymore. Imagine how I felt about selling my truck (for only $6K)!


Oh man, I'm sorry to hear that. Have you been told what caused them? I will keep you in my thoughts and prayers bro. $6K......that had to hurt.

 

[chip]

I had two massive (Grand Mal) seizures, so I can't drive anymore. Imagine how I felt about selling my truck (for only $6K)!


Oh man, I'm sorry to hear that. Have you been told what caused them? I will keep you in my thoughts and prayers bro. $6K......that had to hurt.

Thanks. I've been to two separate neurologists, and they have no idea what's causing them, but they're affecting my entire brain (worst case scenario I'm told). Selling the truck definitely hurt (especially at that cost), but I'm happy knowing my family is still taken care of. That's all that matters to me. I appreciate the thoughts and prayers!

 

[knoslf]

I had two massive (Grand Mal) seizures, so I can't drive anymore. Imagine how I felt about selling my truck (for only $6K)!

Dam Chip I don't know you but we are all Tahoe/Yukon/Eskie fans and I am sorry to hear about the seizures you had and selling the truck I know it must've hurt to say goodbye to the hoe but as a former dialysis patient(got a new kidney not too long ago) I must say, keep your head up and at the end of the day you can always be thankful for the family and loved ones you have and our trucks are just transportation and materialism that wont last forever like true loved ones do, my prayers go out to you and yours that all will get 'greater later' man!

 

[Wake]

You have 4 o2 sensors. Your forward sensors are just after the manifold as each side comes down the side of the bell housing for the tranny , they are the ones that measure how good your truck is burning, then youll have two behind each of your cats, they measure if you have cats. The back two I wouldn't worry about.

I agree. Unless the rear after-cat sensors are throwing codes I wouldn't change them out. The front pre-cat sensors are what affect your fuel economy and driveability.

The other suggestion I have is if the plugs and wires haven't been changed I'd do those first if you don't have codes for the front sensors.

They can be hard or easy to change. Get an 02 Sensor Socket from the auto parts store. You might be able to get away without the special socket but they are worth the $10 you'll spend on one. Other than that, some penetrating oil on the threads overnight can help. Running the truck for 30 seconds to heat up the pipe may make removing them a little easier as well. I start out cold first and if I have difficulty I run the vehicle for a few seconds to heat up the exhaust and then usually have an easier time removing the sensor.

 

[highrollin113]

I had two massive (Grand Mal) seizures, so I can't drive anymore. Imagine how I felt about selling my truck (for only $6K)!


hey man, sorry to hear about the seizures, i went through the same thing 6 years ago, got on meds took a year of trial and error but finally found some that work and let me live a normal life. got my license back and now have the ride i have always wanted, even have a motorcycle, keep your chin up things will get better, best wishes