1999 F150 Codes
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Freshman User
Joined: Oct 2003
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1999 F150 Codes
Went to the local "ADVANCED AUTO" store where the manager plugged in to retreive the codes below on my truck. The check engine light was on. I need help figuring out what to buy or do to make the light go off.
Codes: Vehicle Scanned
Global OBDII
Vehicle
DTC (CODES)
PO174
System Too Lean
(Bank 2)
DTC Pending (Codes)
PO171
System Too Lean
(Bank 1)
Okay, is this something the DYI can do? Or do I have to send into a Ford Dealer $$$????
Codes: Vehicle Scanned
Global OBDII
Vehicle
DTC (CODES)
PO174
System Too Lean
(Bank 2)
DTC Pending (Codes)
PO171
System Too Lean
(Bank 1)
Okay, is this something the DYI can do? Or do I have to send into a Ford Dealer $$$????
Elder User
Joined: Sep 2002
Posts: 772
Likes: 0
From: White Sands, NM
Here is what the manual has to say:
HA41 DTCs P0171, P0172, P0174 AND P0175: FUEL SYSTEM AT THE CORRECTED FUEL TRIM
HO2S DTCs Reference list:
HO2S-11 = DTCs P0171 and P0172
HO2S-21 = DTCs P0174 and P0175
Check intake air system for leaks, obstructions and damage.
Check air cleaner element, air cleaner housing for blockage.
Verify fuel level.
Verify integrity of the PCV system.
Check for disconnected spark plug wires.
Check for vacuum leaks.
Verify customer did not run out of fuel
HA41 DTCs P0171, P0172, P0174 AND P0175: FUEL SYSTEM AT THE CORRECTED FUEL TRIM
HO2S DTCs Reference list:
HO2S-11 = DTCs P0171 and P0172
HO2S-21 = DTCs P0174 and P0175
Check intake air system for leaks, obstructions and damage.
Check air cleaner element, air cleaner housing for blockage.
Verify fuel level.
Verify integrity of the PCV system.
Check for disconnected spark plug wires.
Check for vacuum leaks.
Verify customer did not run out of fuel
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Freshman User
Joined: Oct 2003
Posts: 48
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Roger: Thanks for getting me those codes. I printed them and went to my 99F150. Started to look at various hoses, etc. I finally found one small hose that had a small crack in it causing the leak! Went to Advanced Auto (Usually go to AutoZone but the counter was full and the Advanced guy originally read the codes for me) and bought some Ventilation high temp hose, cut it, and replaced the bad section. Also bought a new air filter. Took battery cable off, installed parts, and cranked her over. The check engine light went off. I started and stopped her about 3 more times and no light! Hope that takes care of it until something else goes on this 178,000 mile truck.
Thanks for your help and thanks to whoever started this website! Very helpful!!!
Thanks for your help and thanks to whoever started this website! Very helpful!!!
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Shoob36
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