Mechanics

DRIVE CYCLE O2 SENSOR NOT SETTING

1999 GMC Safari

Engine Performance problem
1999 GMC Safari 6 cyl Two Wheel Drive Automatic 120000 miles

The heated oxygen sensor diagnostic is not running when I perform the drive cycle test (let the engine idle from cold start).

I'm getting P0146 o2s No activity detected 1/3.

Does that mean the downstream sensor (or another) is bad or can it be from a bad catalytic converter?
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Dabrfowski
May 21, 2010.




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