Question about 1998 GMC Sonoma

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1998 GMC Sonoma threw code P1133 02S 1/1

I have a 1998 GMC Sonoma extended cab and the Check Engine Light has just come on. I had AutoZone read the code "P1133 02S 1/1 - Transit Time Ratio", but don't know what it means. Can anyone advise?

I recently had the front main seal and the oil pan seal replaced as well as the fuel filter.

Thanks in advance!

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P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.

Posted on Apr 20, 2009

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