Repair advice. Bad Cat and Coolant system.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by MonkButter, Aug 29, 2025 at 1:48 AM.

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  1. MonkButter

    MonkButter Junior Member

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    Failed inspection due to emissions (P0420) and cylinder misfires. Changed my spark plugs today and all misfire codes stopped but new codes came on. P1116, P1117 and P1121. Topped my coolant tank which was very low but still popping on with the temperature warning and red triangle.

    Ran dr Prius battery life test with my OBD2 and scored 85% but it does say it’s running warm,

    You guys think with the Cat P0420 and coolant issues it’s worth repairs? 2007 with 250k. Today while flushing Cat cleaner through I lost all acceleration and needed full reset to get home. Not sure what to do.
     

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    #1 MonkButter, Aug 29, 2025 at 1:48 AM
  2. Tombukt2

    Tombukt2 Senior Member

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    Get your coolant filled first. Needs stand at top of filler neck 5 min without dropping leveltop off jug and cap. That'll make all your coolant sensors definitely be submerged . Clear codes . Drive and see .
     
    #2 Tombukt2, Aug 29, 2025 at 2:11 PM
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