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| MazdaSpeed 3 - Engine, Transmission & Driveline Discussion of engine, tranny and drivelines. |
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12-12-2014, 05:00 AM
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(Thread Starter) |   Not Ranked : 0 score  Cobb Downpipe Code P0421 Hi there, after installing the COBB Downpipe I get this P0421 Code sometimes. How can I get rid of it? I have no AccessPort. Would a defouler help on the second o2 sensor? I searched a lot for an answer butr couldn't find anything really helpfully. Regards |
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