Catalytic converters may go bad and plug exhaust on Ford F-150

Catalytic converters can go bad and potentially plug the exhaust, hurting engine efficiency and performance.

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Average mileage: 117,570 (100,021–141,000)
3 model years affected: 1991, 2003, 2007
4 people reported this problem
2 people shared problem details
2003 Ford F-150111,689
Using oil and turned black. Sutt coming out tailpipe,valves rattling, loss of power and service light is on
1991 Ford F-150141,000
bad backpressure on my motor.removedandreplaced cov\nvertorit wasplugged80 percent.fixed theproblem
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