Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1691 Information for specific makes
P1691 BUICK
P1691 CADILLAC
P1691 CHEVROLET
P1691 DODGE
P1691 GMC
P1691 HYUNDAI
P1691 CADILLAC
P1691 CHEVROLET
P1691 DODGE
P1691 GMC
P1691 HYUNDAI