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Here’s the outcome of this endeavor. After replacing the cat and the o2 sensors, it is running like a new car. The real-time data from the o2 sensors is correct. Thanks all for the input that helped me with this issue.
Update: After much rending of clothing and gnashing of teeth, the cat is completely out of the car.
Next is to get a replacement and then put it into the car. From what I’ve learned removing the
old one, it will be much easier to put the new one in. For one thing I won’t have to worry about bolt
that have become friction welded in place!
I plan on replacing all four O2 sensors at this time too unless someone convinces me that it would
better to wait. I really appreciate the input I’ve gotten here.retirement does have some benefits. I’ve got till the first of Nov to fix it or drive my lifted F-250 Superduty with the full bed to my wife’s doctor. Parking is a B____, but driving on Central does get a bit of respect.
Today, I removed the wheel well splash guards and that has greatly improved the access. Still gonna be rough but I feel better about it.
Looks like I have the exact scenario you described. intermittant code and flucuating downstream o2 sensors. With the explaination of how the loose stuff in the cat can clog and un-clog the other post provided, it’s time to pull that blasted thing.
Thanks for the welcome. I was drawn here by the videos posted on youtube. I like Eric’s approach and style.As you said, the upstream o2 sensors are fluctuating in that range. And since they downstream sensors are giving values they are probably functioning at least somewhat.