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Engine code P0435 on a 1999 Ford Ranger typically indicates a malfunction in the heated catalyst efficiency, often related to the oxygen sensors or the catalytic converter itself. To fix this issue, first inspect the wiring and connections of the oxygen sensors for any damage or corrosion. If those are intact, testing and possibly replacing the upstream and downstream oxygen sensors may be necessary. If the problem persists, further evaluation of the catalytic converter is recommended, as it may need to be replaced if it’s damaged or clogged.

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1mo ago

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