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2004 F-150 FX4 5.4 Triton P0171, P0174 and P2197 - Ford F150 Forum
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P0171/P0174 codes. PCV valve? w/pictures - Ford F150 Forum - Community
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Please Help-P0171,P0174 - Ford F150 Forum - Community of Ford Truck Fans
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Ford F150 P0420: Catalyst System Efficiency → Below Threshold → Bank 1
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2004 F-150 FX4 5.4 Triton P0171, P0174 and P2197 - Ford F150 Forum
![P0171/P0174 codes. PCV valve? w/pictures - Ford F150 Forum - Community](https://i2.wp.com/www.f150forum.com/attachments/f6/480863d1500031468-p0171-p0174-codes-pcv-valve-w-pictures-20170713_165520.jpg)
P0171/P0174 codes. PCV valve? w/pictures - Ford F150 Forum - Community