[2000CAYukon]

If you decide to replace the 02 sensors, remember that the sensors before the cat is used for air/fuel ratio. The sensors after the cat are only used to monitor the system. I can't remember if we have 1 or 2 cats (I have been working a lot lately on my 90 K1500 that only has 1 cat).

Hopefully the 4 part B&G kit is 02 sensor friendly.

//2000CAYukon