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I replace 2 O2 sensors and the light still on. What can cause the 1997 Ford Ranger?

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I replace 2 O2 sensors and the light still on. What can cause the 1997 Ford Ranger?

Vehicle: 1997 Ford Ranger

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If wiring is fine ,there are alot of other reasons,Cat could be bad,leak in exhaust system,vacum leak,best to get it scanned with a tester that has live data and check fuel trim levels

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