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

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

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1 answer
you need another shop. someone who can give you definitive answers. you need the code numbers to see where to go.

Roy