Question about Mazda Millenia

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Hello i have a 1999 mazda millenia and i went to auto zone to get the free diagnostic test and they came up with the several codes: p105- manifold pressure sircuit, p170 fuel trim(02 sensor), p173 system to lean(O2 system), p400 exhaust gas egr valve, p421 catalic converter bank 1 and p1525-unknown. can you give me some kind of advice on what to do? Or how to fix myself?

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My suggestion is to change one at a time and hope to fix the problem ,but eventually they will all need to be replaced,

Posted on Oct 02, 2009

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