Focus 1 (Bj. 98-01) DBW/DAW/DNW/DFW ST170 DCT P1131 help

Diskutiere ST170 DCT P1131 help im Focus Mk1 Forum Forum im Bereich Ford Focus Forum; Hi Guys, I have a 2002 ford focus st170. It's throwing up code p1131 Lack of Upstream Heated Oxygen Sensor Indicates Lean - Bank No 1. I...

  1. #1 leenammoz, 28.10.2014
    leenammoz

    leenammoz Neuling

    Dabei seit:
    28.10.2014
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    Fahrzeug:
    Modell
    Hi Guys,
    I have a 2002 ford focus st170. It's throwing up code p1131 Lack of Upstream Heated Oxygen Sensor Indicates Lean - Bank No 1. I am getting loss of power, rough idling and poor fuel economy. After some research I cleaned the maf, plugs and checked for air leaks, but couldn't find any. The car is running slightly better but the cel came back on again with p1131. The lamda that it refers to was replaced last year then the car was stood for 11 months as i was away, so I can't see it being a bad sensor. Any ideas anyone?

    Andy
     
  2. naja08

    naja08 Benutzer

    Dabei seit:
    23.10.2012
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    Fahrzeug:
    Focus MK2 1.8l TDCI 115PS 04/08 Facelift
    Do you have problems all the time or just if the engine is warm/cold?

    You can check for air leaks with an accelerant (spray for cars of course), if it revs up when you spray it on some pipes you'll have your leak (of course be careful and don't spray it on hot parts.

    And by the way: if you're English, try it in an English board.. This one is German :)!

    Good luck with trying
     
  3. #3 Meikel_K, 28.10.2014
    Meikel_K

    Meikel_K Forum Profi

    Dabei seit:
    05.11.2010
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    Focus 2015 Trend Turnier 1.0 EB / 92 kW
    This one may point you into the right direction: http://autorepair.about.com/library/a/1e/bl479e.htm

    It appears that the Lambda is too lean - potentially due to leakages behind the MAF sensor or a choked injector - beyond the control limits, so that the Lambda controls cannot compensate for it.

    Did any of the spark plugs exhibit a suspiciously light colour?
     
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ST170 DCT P1131 help

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