what is code po440 on a 1997 gmc jimmy

Asked by canadaone Apr 26, 2014 at 08:56 PM about the 1997 GMC Jimmy 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

my check engine light is on had the computer read and its showing code po440 and
po441 sensor bank 1 sensor 2.what are these and are they easy to repair.

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