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Mass Air Flow Meter <--> [Air Flow Meter/Sensor] > < Air/Fuel Mixture|System Diagnosis

4 Runner 4WD L4-2.7L (3RZ-FE) (1996)

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If the CO/HO concentration does not comply with regulations, troubleshoot according to the table above.
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Check heated oxygen sensor operation.

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Check and correct the cause if necessary

Mass Air Flow Meter <--> [Air Flow Meter/Sensor] > < Air/Fuel Mixture|System Diagnosis