1999 GMC Yukon 02 sensors

1999 GMC YUKON
144,568 MILES • V8 • 4WD • AUTOMATIC
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MCACIOPPO
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  • 1 POST
i have a fault code of p0420, it is the downstream sensor.But witch do i change out the right or the left
Apr 2, 2009 at 7:00 AM
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JDL
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  • 16,098 POSTS
Hello, the driver-side bank. Bank 1 is the cylinder bank where the number 1 cylinder is located.
Apr 2, 2009 at 8:10 AM