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  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...
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