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Fuel Trim Excursions
Posted to Emissions Forum on 3/31/2010 90 Replies

Hi EmFers,

I worked on a 1997 Oldsmobile Achieva 2.4L CAP vehicle last week. It came in with a P0420. I checked the front O2 sensor with a Vantage. It produced a 30ms second snap throttle test. The oxygen sensor appeared to be working within normal operating... Login to read more.

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