I did a search, but couldn't find what I was looking for.

I'm trying to remove a downstream (post cat) O2 sensor. I've put penetrating fluid on it, but can't seem to get a bite on it with an 11/16 wrench. I'm guessing that it needs to be 17mm, but not entirely sure.

Is 17mm the correct size for the nut removal?

Thanks!

--DD

 

Nevermind... I whipped out the vise-grips and out it came. However, Auto Zone sold me the wrong part.

 

How many miles on your truck, why aren't you replacing all 4 if you are close to 100,000 miles?

 

Just going off of what my OBD II reader told me. Downstream O2 sensor.

Oh... and 131k on the ticker.

 

At that mileage, you should replace all 4 02's to regain some long lost power and mileage by better managing the air fuel ratio.