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    Toyota/Yaris/1999/1.0 Archived Message

    Posted by Nigel Bennett on May 14, 2008, 9:31 pm

    Hi all need some help with this one .
    Code P0170 system rich .At idle up stream sensor switching ok and with in expected values .Rear sensor stays fixed at 900mv,at 2500 rpm up stream switching faster as expected ,rear sensor now drops to near zero volts ,during both these phases the gas are all good with a bias towards the lean.
    When the throttle is just moved of idle both sensor indicate the system going lean as opposed to what i would expect a richening .There is also a wide flat spot on stabbing the throttle this feels like a faulty MAF ,any ideas please .

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