If I Disconnect My Oxygen Sensor On Car How Will That Affect The Emissions

Posted in Oxygen Sensors | Asked on Aug 7, 2010

I failed the e check and I can’t get oxygen sensor to unscrew .

There are 10 Answers for "If I Disconnect My Oxygen Sensor On Car How Will That Affect The Emissions"

  1. ramall1to says:

    Probably make it a lot worse. Best way is to just get it fixed or take it in to someone that can get it out for you.

  2. 32George says:

    The oxygen sensor is hard to remove as it is in a place that gets extremely hot and has some corrosion. Try putting releasing oil around it to soak in overnight and try to remove it before you run the engine again.

    Most cars will put on a warning light of some type, usually the one that just means “go to your dealer” when this sensor packs up.

    It’s failure or removal will effect your emissions and fuel economy

  3. mass_1986 says:

    I was a mechanic a few years ago and know it will mess up your emissions. Also your check engine light will most likely come on as well. Your best bet is to have it replaced by a mechanic due to the position of the sensor.

  4. computer_glitch_uhoh says:

    If you don’t get your o2 replaced you’ll have poor engine performance and bad fuel economy.

  5. NEWBEE1 says:

    It will run like hell, not to mention the noise generated. The other guys are correct about the removal, but you can also try penetrating oil and a propane tank. Don’t forget the hammer. Tap, Tap, Tap

    I noticed that a lot of cars fail due to the EGR valve, make sure that it’s working.

  6. psonit says:

    youre supposed to have a special socket to get thoes out if you can heat the exaust with a torch not the sensor then uncrew it it should come out with ease

  7. euaniebabs says:

    99% of the time, if your oxygen sensor is causing emissions failure try the following:

    Take the sensor out, put on some goggles and gloves then take a torch/blowlamp to the sensor and get it red hot for 2 – 3 minutes.

    Put it back in, reconnect and retry.

    Driving around like a granny or with a rich mixture furrs up the sensor with carbon and stops it working correctly. This heat cleans it all out and usually solves the problem.

    Euan

  8. jdm says:

    It will effect emmissions because you car’s computer is taking readings from that–your exhaust gasses–and determining how to mix fuel with air back up in the top of the engine. Removing that will A) leave a hole in your exhaust, under your car, which will be loud and will send a pure exhaust smell up through your car. It’s more than just a smell though…CO is dangerous and can kill you, that why exhaust pipes typically flow out the rear of the car. B) it will throw your car’s computer out of whack since it is no longer getting readings and will misadjust your fuel/air curve. Your car will run terribly, stink, and as someone mentioned, you engine light will come on.

    As far as getting it out, heat will expand the metal around it, and you’ll be able to unscrew it, like others have mentioned. When you replace it, use something called “anti-seize” compound. It comes in ketchup-like packets at the front counter of most auto-parts stores.

  9. peanut23536 says:

    I’m assuming you are certain it is bad? Just because it fails an e check doesn’t mean it’s the O2 sensor.

  10. tomspoerl says:

    You will use gas more gas and emission levels will go up and you will still fail the emissions test I would recommend trying to heat the exhaust pipe around the O2 sensor get it red hot then try to remove the O2 sensor if it still will not come out you will probably have to replace that part of the exhaust I have ran in to different O2 sensors that the treads got messed up from the exhaust heat and where unremovable good luck

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