No Cats/ Sensor
Thread Starter
Intermediate
Joined: May 2018
Posts: 40
Likes: 0
From: Dallas, Texas
No Cats/ Sensor
Hello all,
I've had my Corvette since 2018, and the previous owner installed X-pipes with high-flow cats. After some time, I removed the cats, and everything was fine—no code and it passed emissions. I assumed the previous owner did something to bypass the cats. Recently, I got a code for a bad downstream sensor (though there’s no check engine light), and I was wondering: can I just replace it with a new one without altering whatever bypass the previous owner did? Or are there special sensors or something else I should look into?
Thanks in advance.
I've had my Corvette since 2018, and the previous owner installed X-pipes with high-flow cats. After some time, I removed the cats, and everything was fine—no code and it passed emissions. I assumed the previous owner did something to bypass the cats. Recently, I got a code for a bad downstream sensor (though there’s no check engine light), and I was wondering: can I just replace it with a new one without altering whatever bypass the previous owner did? Or are there special sensors or something else I should look into?
Thanks in advance.
Tech Contributor
Joined: Jan 2007
Posts: 19,359
Likes: 1,127
From: Dyer, IN
Hello all,
I've had my Corvette since 2018, and the previous owner installed X-pipes with high-flow cats. After some time, I removed the cats, and everything was fine—no code and it passed emissions. I assumed the previous owner did something to bypass the cats. Recently, I got a code for a bad downstream sensor (though there’s no check engine light), and I was wondering: can I just replace it with a new one without altering whatever bypass the previous owner did? Or are there special sensors or something else I should look into?
Thanks in advance.
I've had my Corvette since 2018, and the previous owner installed X-pipes with high-flow cats. After some time, I removed the cats, and everything was fine—no code and it passed emissions. I assumed the previous owner did something to bypass the cats. Recently, I got a code for a bad downstream sensor (though there’s no check engine light), and I was wondering: can I just replace it with a new one without altering whatever bypass the previous owner did? Or are there special sensors or something else I should look into?
Thanks in advance.
Instructor
Joined: Nov 2019
Posts: 162
Likes: 80
From: Central NJ
There's no way you wouldn't have a check engine light after removing the cats. Even aftermarket high flow cats would have caused P0420, P0430. Previous owner probably had the code turned off or set to No MIL with a tuner.
If you have no light annoying you and you can pass emissions, then do nothing. If you don't want the code at all, then head to a tuner.
Buying a downstream O2 sensor would be completely useless. It's function is to monitor the efficiency of the cats. You don't have any to monitor.
If you have no light annoying you and you can pass emissions, then do nothing. If you don't want the code at all, then head to a tuner.
Buying a downstream O2 sensor would be completely useless. It's function is to monitor the efficiency of the cats. You don't have any to monitor.
