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Theo (guest)
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I have a '05 987 and I replaced the plugs and oil. Shortly after that my cel came on and my AOS failed. I replaced the AOS. My cel still comes on and I'm getting codes P0300 and alternating P0301, P0305 and P0306 and car will shut down. Should I change the coils too? Any suggestions on other things to check

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This post was auto-generated based upon a question asked on our tech article page here: Porsche Boxster Air / Oil Separator Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article
Old 09-13-2017, 06:45 AM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
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You'll need to determine why the engine is misfiring. I would check spark, fuel and compression on all cylinders.

- Nick
Old 09-13-2017, 06:45 AM
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Are you sure

the plug wires are correct and not reversed? The coilpacks are firmly attached?

Did the CEL happen before the work was done? Last thing touched is often suspect.
Old 09-13-2017, 03:21 PM
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