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Erratic idle and codes

  • 2007
  • Boxster
Mileage: 
80 100
Engine
Pittsburgh, 
Pennsylvania

 

in September of 2018 I had the water pump on my '07 base Boxster replaced at an independent garage specializing in Porsche repairs. The day after the installation I began experiencing some unusual new problems. My idle speed, which had never varied prior to the repair, suddenly became wildly variable...never going below 800 RPM but randomly creeping up to 1200, 1500 and sometimes surging to 1800 RPMs. Soon to follow was the check engine light with P2187 & P2189 codes. These conditions still exist today.
So, Is it conceivable possible that replacement of the water pump and the following immediate onset  of these previously nonexistent conditions are somehow related, or purely coincidental? Additionally, is there a general or common cause for the codes I'm seeing, and what can I do? Recommendations please. 
Thank you

Greg Z

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