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There are two. The first one sits in the exhaust manifold of the engine, right between the engine and the firewall. This would be Bank 1, Sensor 1.The second is located on the exhaust tube, right after the catalytic converter. This would be Bank 1, Sensor 2.
The second is easiest to get to and replace. The first one is by far the hardest and requires you to get at it from underneath the vehicle and absolutely requires you to have the vehicle on a lift or safely have the front half of the vehicle on jacks.
I'm a rotund individual and I also needed to have the car jacked for the 2nd sensor.
One other suggestion, make sure when you rent or buy your O2 sensor tool, it is for the size ratchet you have (3/8, 1/4, 1/2 etc). The one the store gave us to use was a 1/2, and I only had 3/8 and 1/4. I finally spent $13 for the GM O2 tool for 3/8...much easier.
What else can I help you with?
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Buick Rendezvous was created in 2001.
