It has two 02 sensors one before the catilitic converter and one after and both are on the exhaust pipe you can see them and they will have 4 wires on them, it takes a special wrench to remve them, called an 02 wrech costs about $30.00 but you can't remove them without it. The 02 sensor wears out over time and normally gets lazy, meaning it does not shift voltage fast enought so the computer throws a fault code. Best way to figure out which one is take it to autozone or schucks and have it scanned for free then buy the sensor from them to replace. This is not to hard of a fix. If you need more information just make a post here.
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