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p0139

  1. P0139 after going catless

    2004-2009 Mazda 3 Performance & Mods
    Keep getting a p0139 after removing the cat on my 06 2.3L. Just curious what causes it.
  2. P0139 need help

    2010-13 Mazdaspeed 3 Engine and Performance
    So had this code for a while, i have no exhaust leaks fuel pump is doing good Well above 1600 a/f is spot on 14.7 at idle and also cruising and it's Like 11.2 when wot. I have a new 02 sensor so it's not faulty. When I rip my car It like bogs or stutters but if I let off the gas a little and...
  3. CEL: P2237 and P0139 after downpipe and racepipe install

    2010-13 Mazdaspeed 3 Engine and Performance
    kj
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