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2023 Toyota Highlander Technical Service Bulletin – MIL ON With DTC POSCEOO

Introduction

Some 2023 model year Highlander vehicles equipped with a T24A-FTS engine may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) POSCEOO.

Warranty Information

This repair is covered under the Toyota Federal Emissions Warranty, effective for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.

Repair Procedure

Follow the steps to address the MIL ON condition with DTC POSCEOO, including reprogramming the ECM (PCM) and clearing any DTCs.

Manual:

Download: 2023 Toyota Highlander Technical Service Bulletin – MIL ON With DTC POSCEOO

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