I had the same codes and CEL and needed to get tested for emissions before renewing my license. I, sadly, do not wrench so I offered a good friend with a 987 for help, in exchange I will be washing and waxing his car. He asked me to buy a new air filter. He cleaned the MAF and installed the air filter, then got rid of the codes. I drove it normally a few days then went for emissions testing and PASSED! So far, CEL hasn't reappeared.
Larry (the Bald Eagle)
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