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dgm1214's Recent Activity

  1. dgm1214 replied to the thread Faults PO420 (catalyst system efficiency below threshold) ..

    Update2. Drove only about 5 miles today before engine light appeared. Same 2 codes as before 1) P0420 catalyst system efficiency...

    Sep 16, 2024 at 3:16 PM

  2. dgm1214 replied to the thread Faults PO420 (catalyst system efficiency below threshold) ..

    Update, reset codes again, and after 50 miles NO codes popped up. Will test drive tomorrow too.

    Sep 15, 2024 at 9:25 PM

  3. dgm1214 posted a new thread.

    Faults PO420 (catalyst system efficiency below threshold) .

    This popped up after replacing both oxygen sensors, on a 2013 with 177k miles. Prior error was related to faulty downstream oxygen...

    Forum: Gen 3 Prius Main Forum

    Sep 15, 2024 at 6:34 PM
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