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FORD PO174 & PO420 - 2008 Ford F 250 Super Duty 4WD

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Posted on Jan 02, 2017

Murphybanton
  • 2004 Answers

SOURCE: trouble codes PO174,PO401,PO420 NEED TO FIX SO I

P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)

Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com

Posted on Sep 28, 2009

  • 1 Answer

SOURCE: i have trouble code po420 and po174 .where do i

check your MAF sensor and air filter and housing.

Posted on Sep 10, 2010

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2002 eord F150 po174 system adaptive fule too lean bank2


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3 Answers

Trouble codes PO174,PO401,PO420 NEED TO FIX SO I


P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)

Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com

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1 Answer

Code po171 7 po174


your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

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