Question about 1998 Audi A4

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O2 sensor If i get a Toyota O2 sensor 4 wires that is good from my scraps and get the wire sliced to match the polarities and wires of the audi A4 4 wires type, will it work for me. I thought this since the universal one can work with most cars. please assist.

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  • councharles Dec 22, 2008

    The liters/100km shot up from average 22 l/100km i use to get before i changed it to 27 and 32 l/100km and i noticed heavier fuel consumption. Does it mean it doesn't work, not good or is there something i have to do after fixing the Toyota model

  • councharles Dec 22, 2008

    The ones i changed were the front O2 sensor pairs with the Toyota ones, (a Type B model) i had Type A in my car before. Am sure of the connections. And i know the front O2 sensors affects fuel consumption. So does it mean it doesn't work, not good or is there something i have to do after fixing the Toyota model



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Most likely t will work, just make sure you get the O2 ground,the heater element and signal return circuits connected correctly.

Posted on Dec 19, 2008

  • yadayada
    yadayada Dec 22, 2008

    A Catalytic Converter monitor has no affect on fuel consumption, this is like a n O2 sensor, but it's job is to measure the amount of oxygen coming out the back of the cat, the computer use this info to determine if the Cat is doing it job of cleaning the exhaust. I did not ask your miles per gallon, I asked the miles on the car, your Cat may be worn out and that is why the CEL for the cat monitor.

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How to Replace the O2 Sensor in a Audi All road Car?


O2 sensor needs to be replaced when you get low gas mileage in car.
The procedure to replace is as follows: ----
1) The oxygen sensor is located under the car.
2) Put the car on jack stands on the rack, this will give you proper sensor location in the car.
3) The sensor has to be turned a bit then it can be easily removed.
4) Most of the times the O2 sensor comes out very easily but if its bit hard to remove it then you can use "FREEZE spray" to make it gets loose.
5) The spray will make it come out easily.
6) When the O2 sensor is getting removed, some of the wiring's will also come out.
7) Before removing the O2 sensor, take the note of the wiring's and the position of wiring so while inserting new O2 sensor you don't get confused.
8) Now after you remove the old faulty O2 sensor out. Carefully insert new O2 sensor in same position.
9) And reverse/refit all the wires / parts which you removed while replacing the old O2 sensor.
This will help. Thanks.

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