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    Toyota Yaris, 1999, 1.0L Archived Message

    Posted by Ian Staples on July 14, 2008, 11:56 pm

    Failed MOT on emissions, CO% 0.35-0.6, just within limits at idle.

    No codes present. Live data shows O2 sensor staying in closed loop but staying about 800mV on fast idle with an occasional brief switch down to 300mV and back up again. On idle the O2 sensor switches normally.

    With sensor simulator forcing lean/rich mixture the ECU indicates lean/rich mixture and seems to react.

    Ran out of time but suspect faulty O2 sensor and poor CAT ???

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