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2012-2013 Scion iQ Rough Idle with Check Engine Light On

Discussion in 'Engine Mechanical' started by Kaiju, Dec 1, 2016.

  1. Kaiju

    Kaiju Administrator MDT Platinum Contributor

    Some 2012 – 2013 model year iQ vehicles may exhibit one or more of the following conditions:

    Rough idle condition.
    Idle speed momentarily drops at idle.
    MIL “ON” with one or more of the following DTCs: P1603, P1604 and/or P1605.

    A new Valve cover along with the TSB repair procedure has been developed to address this condition, part number 11201-47121

    Genuine Toyota Fluid 00289-1TE00 Top Engine Cleaner

    These codes may be caused by excessive carbon build-up on piston head. Follow the Repair Procedure in Technical Service Bulletin 0008-16 to address this condition.

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