Component in truck
Senior Member
Joined: Jun 2010
Posts: 535
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From: Napa Ca, United States
That would be the O2 sensor clock. Every 30,000 miles that device triggers the O2 sensor light on the dash. You push the white button to reset the counter and turn off the light. Jag basically wants you replacing the O2 sensors every 30,000 miles.
Last edited by EcbJag; Jan 14, 2019 at 02:17 AM.
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