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P0174 is system too lean (bank 2). Probably the result of a fairly large vacuum leak pertaining to bank 2 (drivers side). Spray the area with carb cleaner while the engine is running. If you spray an area and the engine rpm's increase, you have found the area where the leak is. If no leak is found, it would require further diagnoses with a live data scan tool.
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∙ 8y ago
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Fault codes 0171 and 0174 Ford Explorer sport?
P0171-system too lean bank 1 and P0174-system too lean bank 2
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