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Idle Speed > < Air/Fuel Mixture|System Diagnosis

T100 Pickup 2WD L4-164.4 2693cc 2.7L DOHC (3RZ-FE) (1995)

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

Idle Speed > < Air/Fuel Mixture|System Diagnosis