1999 GMC Safari Drive cycle O2 sensor not setting

Tiny
DABRFOWSKI
  • 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?

Do you
have the same problem?
Yes
No
Friday, May 21st, 2010 AT 7:51 PM

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