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CEL on for code p0171

Discussion in '2005-2010 V6 Mustang Tech' started by 20Mustang05, Oct 7, 2016.

  1. 20Mustang05

    20Mustang05 New Member

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    Alright guys i have an 05 mustang and ive had it for about 3 years now no problems. Till about a week ago, i got the cel on and went and got the codes read, came back as p0171. Bank 1 to lean. Ive read through the symptoms and possiblr causes.
    And im stumped because my car is running great no stumbling sporatic idling or anything of that sorts idles smooth no shakes. So if you guys have any suggestions. Also i only got that one code, thats it.
     
  2. 20Mustang05

    20Mustang05 New Member

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    Freeze frame data i pulled
    Trouble code p0171
    Fuel system 1 clsd
    Fuel system 2 n/a
    Calc load % 35.7
    Coolant temp 200
    St ftrm 1 6.3
    Lt ftrm 1 18
    St ftrm 2 -3.1
    Lt ftrm 2 6.3
    Map "hg 8.9
    Engine speed 933 rpm
    Ign advanc -0.5
    Iat 131
    Maf lb/m .75
    Abslt tps 15.7
    02s11 v .055


    My understanding is the fuel trims should be uniform, any ideas as to why the second set are out of wack.
     

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  3. Phil II

    Phil II Cone Destroyer Staff Member

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    Is there any evidence of exhaust or vacuum leaks? Would probably be very small of either were the cause of cel without affecting driving.
     
  4. 20Mustang05

    20Mustang05 New Member

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    No exhaust leaks, i cleared the code and then drove it to oriellys to return some things earlier ran and drove fine no check engine light ran the freeze frame data again my fuel trima were ever at 3.9 and 2.3. Shut the car off and came back outside to leave start it up and bam cel came on ran the code came up with 2 pending and one confirmed code.
    The 2 pending are p0053 p0059
    The conformed is p2197
     
  5. 20Mustang05

    20Mustang05 New Member

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    And no vaccum leaks i could find checked the maf and pcv and the brake booster.