There are two oxygen sensors and two catalyst monitors. Two on each side in the exhaust pipe The oxygen sensors are toward the front of the exhaust while the catalyst monitors are more towards the middle of the exhaust. The catalyst monitors are actually oxygen sensor but they are called monitors because they just monitor the catalytic convertor to make sure it is working. The catalist monitors will not cause a drivability issue just the check engine light. Here is a picture to aid in finding them. If this helps an accept would be appreciated. If I can be of more assistance please ask.
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