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If you have never replaced your O2 sensors it is well past time. The normal service life for O2 sensors is generally 60-75K. Your vehicle probably has a good 200K which means you should replace all of the oxygen sensors. These sensors are a major input to the engine management computer ...specifically providing info about fuel mixture. When the O2 sensors fail they provide bogus information; replace them all and you'll find your Bonny will run a *whole* lot better.
The upper O2 sensor is located on the exhaust manifold/s, and the rest is down the line. Some Vehicles have 2, 3, etc. The Upper O2 reads and helps control air/fuel mixture, the lowers usually monitor emissions, and Catalytic converter efficiency.
First what do you mean by a universal o2 sensor? You must make sure that you have the right o2 sensor, most newer vehicles have four o2 sensors 2 upstream and 2 downstream, upstream and downstream are meant to show where the sensors are in relation to the catalatic converter,some o2 sensors have 1 wire or up to 4 wires most with four wires are heated o2 sensors so you need to be sure you ve gotten the right o2 sensor for you vehicle as well as the right replacement for the proper location! My experience is that most after market o2 sensors have the same colored wires as the vehicle. Also most o2 sensors have electrical plugs? If you need help finding the right o2 sensor for your vehicle then please dont be affraid to ask!
There is no repair to a faulty or broken o2 sensor.If its broken you can replace it easily knowing which one you need to buy.There is more than one o2 senser and if its a faulty sensor you will need to know which one you'll need to buy.If your vehicle has over 100k miles you should consider replacing them all.Some garages will locate and tell you the problem for a smaller fee than them doing the repair itself,then you can fix it your self and save a few bucks.