Do I need the O2 sensor after the CAT?
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Do I need the O2 sensor after the CAT?
Why is there two O2 sensors? My 96 Ranger 2.3 ltr has one O2 sensors in front of the Cat and one behind the Cat. I unpluged the one behind the Cat and can not tell any difference. No check engine lights or ill effects. I want to put on larger exhaust pipe and was wondering if I can ditch that second O2 sensor?? Do I need it? What does it do that the front one is not doing?
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That makes since. So as long as I have a CAT but no 2nd sensor it should not effect the efficient running engine. right? If I don't get a CEL by this Friday, driving it every day between now and Friday. Do you think I would be ok to start my weekend project of changing the exhaust?
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Wow those tuners are quite expensive! I cleared the CEL code which was the error code for the rear O2 sensor. I plugged the O2 sensor back up and tied it to the outside of the exhaust pipe so it would detect heat. Hopefully that will prevent the CEL, I'm to cheap to buy one of those expensive tuners.
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Wow those tuners are quite expensive! I cleared the CEL code which was the error code for the rear O2 sensor. I plugged the O2 sensor back up and tied it to the outside of the exhaust pipe so it would detect heat. Hopefully that will prevent the CEL, I'm to cheap to buy one of those expensive tuners.
Sorry, that won't work. The O2 sensors have to be in the exhaust flow inside the exhaust pipe.
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If you want to run catless (Like I do in my Evo) then simply use 2 spark-plug defoulers to pull the sensor out of the flow so it doesn't smell all of the ****. I have been running this way since the car was 1 week old when I put my catless block-back exhaust on. 13500Miles, no CEL, no codes. Tuners have been doing this for years on turbo-cars.
You can turn off the o2 sensor right at the ECU, but I wouldn't buy a handheld "tuner" - All you need is the software for your ecu and laptop to put it on. Find out what hex address it is.
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As you can see from the pictures I have 2 defoulers screwed together on there. I purchased them for about 4 or 5$.
You will need to use a drill press to open the first one up because the nose of your o2 sensor has a bigger diameter than the defouler. I used a 1/2" inch drill bit, and the o2 sensor had a .47" diameter, so it can just barely get any uncatalyzed exhaust.
You will need to use a drill press to open the first one up because the nose of your o2 sensor has a bigger diameter than the defouler. I used a 1/2" inch drill bit, and the o2 sensor had a .47" diameter, so it can just barely get any uncatalyzed exhaust.
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(for example, I joined the honda civic forum, just to find people to buy my LEDs)
You should join a Lancer Evo forum, or a Impreza STI forum if you are looking for ways to get around ECU/EPA stuff. This is how I learned to remove my converter and fool my ecu. Also disabled my EGR as well!