Oxygen Sensor Question
The original equipment cats are far superior to aftermarket though. I take old ones to the cat recyclers - they salvage the platinum and rhodium and whatnot. The factory cats are worth about 85.00 US, aftermarket - about 6.00.
You'd be surprised how clean the inside of a 20 year old cat can be.
Just for interest's sake.
You'd be surprised how clean the inside of a 20 year old cat can be.
Just for interest's sake.
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Joined: Jun 2015
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From: South Carolina
I do not disagree with you. The way I see it, 205k miles and they're just now at the point of needing replacing speaks volumes about the engineers at Ford. Truthfully to have an engine running as strong as this one, with no oil consumption or leaks, with as many miles that are on it, just solidifies my belief that Ford has been and always will be the way to go.
I'm having a local exhaust shop manufacture a 2-into-1 Y pipe so I can install the new cat in the next few weeks. All said and told it should cost me less than $100 to fix this problem. Further checks have revealed that the cats truly are clogging (pressure tests), and the media inside is breaking up (I can hear it rattling around inside when I tap on them).
Again I am wondering if going from two cats, to just one will cause the downstream O2 sensor to throw a code? Not that I plan on selling the beastie anytime soon, but when I do it would be a great selling point to not have any OBDII codes on it.
I'm having a local exhaust shop manufacture a 2-into-1 Y pipe so I can install the new cat in the next few weeks. All said and told it should cost me less than $100 to fix this problem. Further checks have revealed that the cats truly are clogging (pressure tests), and the media inside is breaking up (I can hear it rattling around inside when I tap on them).
Again I am wondering if going from two cats, to just one will cause the downstream O2 sensor to throw a code? Not that I plan on selling the beastie anytime soon, but when I do it would be a great selling point to not have any OBDII codes on it.
Last edited by BroncoCop; Aug 9, 2015 at 05:44 AM.
I can't say for sure, but I think it probably will. In the 2 cat system, the first one is a pre - cat, the second is the main cat.
The pre cat has roughly 1/4 to 1/3 as much precious metal as the main, but it does do some converting before the exhaust hits the O2 sensor.
Not having it will probably cause the computer to misdiagnose things a little. What it will do to compensate for what it thinks is happening is where I hit the not too sure about that wall.
The pre cat has roughly 1/4 to 1/3 as much precious metal as the main, but it does do some converting before the exhaust hits the O2 sensor.
Not having it will probably cause the computer to misdiagnose things a little. What it will do to compensate for what it thinks is happening is where I hit the not too sure about that wall.
Thread Starter
Junior Member
Joined: Jun 2015
Posts: 13
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From: South Carolina
Well, I guess that were going to find out.... lol
All the research I've done has told me that the downstream O2 sensor does not directly impact engine management and is just a tell-tale if the cats are working properly.
That being said, I'm going to prep the beast for surgery and "git-r-dun". Then I will be able to answer the questions I have and I will be sure to update everyone as to how it worked.
All the research I've done has told me that the downstream O2 sensor does not directly impact engine management and is just a tell-tale if the cats are working properly.
That being said, I'm going to prep the beast for surgery and "git-r-dun". Then I will be able to answer the questions I have and I will be sure to update everyone as to how it worked.