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P0171 lean code? Check the EVAP purge valve. When it sticks open, it allows unmetered air into the intake and the ECU compensates by pushing fuel trims high. Watch live data — positive short and long term trims at idle are the giveaway. A faulty purge valve can easily be the hidden cause of a persistent lean condition. 🔧🚗 #P0171 #EVAP # ...
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