Question about 1996 Mercury Mystique

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Check engine is on

Hello sir
my name is haddis and i have got a mercury 1996 4 cylindor and i have check by a mechanic and he said that the oxygen senser one is damaged so what i ask is that is it ok if i drive it for a while ?

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  • haddisbu Aug 09, 2008

    so is it ok if i change by my self ( i am not a mechanic but am a handy person ) if so would you please tell me where can i find the oxygen senser one (the exact location ) and what tools i need and any other important things
    thankyou very much



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Yes. You can still drive the car without worrying. Your fuel mileage may decrease, and you may begin to smell a unburned fuel (sulphur) smell. Eventually, you will need to have the oxygen sensor replaced or you may cause damage to your catalytic converter.

Posted on Aug 09, 2008

  • Jeff Tom Aug 10, 2008

    There will be TWO oxygen sensors on your car. On a 4 Cyl Mercury, one will be in the front of the car (typically around the area directly behind your license plate) - on the front exhaust manifold. The rear sensor you will need to access from underneath the car on the rear exhaust manifold. You will also need an oxygen sensor socket (a special deep socket with a slot cut down the side to allow the wiring pigtail to fit through). If you are not a mechanic, you may want to just bring it to one to have the sensor replaced.



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Check engine on

o2 sensor is usually located on the manifold of most 4 cylinder engines they are normally a one wire connection. you will need the following:

New oxygen sensor....these can be really expensive.
a open end wrench that fits the O2 sensor, or an O2 sensor socket and a ratchet to loosen and tighten the O2 sensor

Start by driving the car to get the car warm o2 sensors can be very hard to get out if they are cold.

if you think you might burn yourself on something hot put thick gloves on, you will have to disconnect the on wire on the o2 sensor, unfortunately you cant wear gloves while doing this, so be extremely careful as the exhaust will be very hot.

After wire disconnected loosen o2 sensor by going counter clock wise using either a o2 sensor socket or a appropriate wrench

while wearing gloves, after the sensor is loose enough unscrew by hand, remember it is still very hot.

you can let engine cool down now if you want.

put new o2 sensor in tightening it firmly and replug the electrical connector back up.

if your check engine light does not go out take to autozone and have them reset your computer, or you can disconnect your battery cables for 20+ minutes and this resets the computer also.

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