Buick Repair Questions? Ask a Mechanic for Answers ASAP
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The best brand is bosch O2 sensors.
You only replace the ones which are faulty.
There should be 3 sensors. one at each exhaust manifold and one after the catalytic converter.
Actually changing parts that are not flagging the computer as faulty components is not going to help. Fuel mileage helpers would be a tune up and something like the task below.