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P0171 = system too lean (bank 1). First thing I would look for is a vacuum leak. With engine running, spray carb cleaner around engine at suspected areas (vacuum lines, intake manifold gaskets, throttle body gaskets, etc). When you hear the engine rpms increase you have found a vacuum leak.

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8y ago
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Q: HOW DO YOU FIX CODE P0171 ON 1997 FORD RANGER?
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