Posted by Bill Latsha on 3/13/2006, 9:44 am, in reply to "02 sensor vs catalytic converter replacement" The second general rule, it to always replace them all at the same time. They work closely together to regulate the fuel injection, so a new one and an old one just won't work together as well to give you optimum operformance. My first Miata was a 1996 Miata, and I bought the car at 121,000 miles as a fix-up car. One of the first things I did was to replace both of the Oxygen sensors, and what a diference it made in the car! It ran a lot better, and the gas mileage stepped up too! Generally when a Cat Converter goes bad, they either clog up from a dirty exhaust, or the exhaust starts to smell pretty foul. Driving a car with bad o-2 sensors for too long, can lead to messing up the cat converter. I would bet that if you replace the rear oxygen sensor, your problem will be solved. If the front one went bad, the rear one was probably close to going bad too. I went to "Auto Zone" auto parts store, and bought the Bosh O-2 sensors without the Miata plugs on them, and using the splice kit with the new sensor, replaced them myself. It was a full afternoon Saturday job, but do-able. The rear one is the easiest to do also. I think I paid around $65.00 for the sensor. Good Luck!
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I have been told 2 "general rules" about O-2 sensors. One rule is that after 100,000 miles, an Oxygen sensor is about done it's job. After that many miles, the hot exhaust has taken it's toll on the workings of the sensor. The article generally reccommended replacing them after 100,000 miles in any car.
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