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Re: 11 impala o2 monitor
Posted to Emissions Forum on 10/21/2019

John,

I have nothing to add except I can feel your pain. I get in 2 or 3 GM's a month that will not run the O2 monitors. Most of the time I get Evap to get ready first.

I've tried the DFCO and sometime the O2 monitor runs but is it just coincidence?

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