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p0174

  1. 2002 Sienna code P0174

    Sienna
    I started out with the P1155 code (front O2 sensor) replaced that, and got P0174. To the best of my research, this is "mixture too lean". I cleaned the MAF. When that did not work, I replaced it. Still getting the code. What else should I try? The online reports on this one are rather vague...
  2. Long Term Fuel Trim (LTFT) Question and Compare

    Electrical & Computer Systems
    Hi everyone, so I have a 08 Tundra DC 5.7L and I got the dreaded P0171 and P0174 code. Researched a little and found that mine is most likely a vacuum leak because my % goes down as the load goes up (throttle) and if it were fuel related the % would go up as the load went up.I have a scanner...
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