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    P0106 code after P0401 code

    On my GF 2002 Protege LX 2.0L. I had the P0300 & P0421 codes. I changed the plugs, the coilpack and it fixed the P0300. Then I changed the Cat (It was all in pieces inside), and it cleared the P0421. Then, after 2-3 weeks, I got this P0401 code (EGR), so I erased it to see if it would come up...
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