The Toyota Technical Service Bulletin provides a solution for low coolant level and MIL ON DTC P148FOO, as well as poor heater performance in certain Prius (2016-2019) and Prius Prime (2017-2019) models.
Repair Procedure:
Inspect the exhaust pipe for signs of coolant leakage, then remove and replace the front exhaust pipe assembly if necessary.
Important Details:
This repair is covered under the Toyota Federal Emissions Warranty, with a 96-month or 80,000-mile limit, whichever comes first.
Tools and Equipment Required:
A Techstream unit with software version 14.20.019 or later, as well as essential SST cables, are necessary for this repair.
Manual:
Download: TOYOTA Technical Service Bulletin Low Coolant; MIL ON DTC P148FOO, andlor Poor Heater Performance
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