running rich

Asked by Ray21551 Jan 04, 2020 at 01:25 PM about the 2004 Ford F-150 Heritage 2 Dr XLT Standard Cab LB

Question type: Maintenance & Repair

is it worth replacing O2 sensor before plugs and plug wires when engine runs
rich, little rough idle?

2 Answers


If they are bad, replace them. There are no plug wires, you have coils on plugs.

1 people found this helpful.

Replaced both o2 sensors. It's running better but still has a noxious exhaust smell and rough idle when in gear.

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