red triangle after o2 sensor changed out

  1. The Bookfinder
    Thread

    New Upper O-2 Sensor & Red Triangle of Death

    my otherwise excellent mechanic shop just replaced the upper O2 sensor on my 2008 Prius. immediately after driving the 4 or 5 miles home, I...
    Thread by: The Bookfinder, Jul 10, 2026 at 1:33 AM, 0 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
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