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Reduced engine power warning

  • 2009
  • Boxster S
30 238
San Diego, 

While accelerating onto a highway my 987 stuttered a bit as though the plugs were fouled.  I reduced acceleration & was able to get up to highway speed & drove home.  My friend tested the batter which was low so I had a new one installed.  Shortly thereafter I was driving on surface streets & the red “reduced engine power” warmning came on once again.  What is causing the malfunction ?

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