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Old 09-12-2013, 06:10 PM
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2011 f350 check engine light

I have a 2011 f350 srw that is all stock has 34k miles and the check engine light came on. Had a buddy scan truck and it was a p21ab code i looked the code up but what does it mean is goin on.
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Old 09-12-2013, 07:07 PM
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From what I looked up it has to do with your def fluid sensor. Ill post the link for ya. When was the last time u filled ur def? Could be from overfilling or the sensor in there isnt working

Sent from my SAMSUNG-SGH-I747
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Old 09-12-2013, 07:32 PM
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heres a couple i found:
P21AB FORD - How do I fix and clear this fault code? - Engine-Codes.com Q&A
PEAK COMMERCIAL & INDUSTRIAL | BLUEDEF | DIESEL EXHAUST FLUID | FAQS
from everything i can tell it sounds like you could take it to a dealer and possibly do a reflash or have them check the sensor. hope this helps
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