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Q: service engine light on.... on 2001 Lincoln Navigator

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
WENT TO SHOP, THEY TOLD ME MY 02 SENSOR WAS BAD, THEY SUPPOSIVLEY PUT IT IN.. PULLED OFF N LIGHT CAME BACK ON.. NOW TEST READS EGR VALVE, MAF SENSOR, VACCUM LEAK OR FUEL PRESSURE...I MEAN WHICH ONE IS IT? SHOP DOESNT SEAM TO KNOW WITH A DIAGNOSTIC
(1) Answer
you need another shop. someone who can give you definitive answers. you need the code numbers to see where to go.

Roy