The only answer i can come up with is to replace with a non American car.
Before you go broke trying keep that pile of junk on the road. iv'e spent mega bucks on mine getting in deeper by the day.
Good luck
how do you replace a 2004 buick rendezvous input speed sensor
The oxygen sensor on a Buick Rendezvous is located immediately before the converter on the driver's side. You will need either a special socket or a wrench to remove the sensor.
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replace 2002 buick rendevous motor mount
in the breather tube/pipe