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#1
07-29-2009, 06:21 PM
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HO2 sensor P1133
99 Chevy Blazer 4WD
Got the SES code P1133 - Heated Oxygen Sensor (HO2S) insufficient switching Bank 1 sensor 1. Which O2 sensor is that and where is it located specifically? How do I test an O2 sensor? I know it needs a multimeter and I'm good with the meter, but am I pulling the sensor and checking ohms across it? How much resistance should there be (generally)? Thanks for the help guys 
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