I had ABS and PSM lights after about 15 to 30 minutes of driving and the cause was a faulty switch on the brake pedal. Does your Cruise Control work? Mine didn't until I replaced that switch.
Here's the replacement guide: https://www.pelicanparts.com/techarticles/Boxster_Tech/93-ELEC-Pedal_Switches/93-ELEC-Pedal_Switches.htm
For the other issue, I'm guessing MAF sensor is bad. If it hasn't ever been replaced, a new one wouldn't be a bad idea anyway. Go with a genuine Bosch, do not try a generic bargain.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
Last edited by 78F350; 11-05-2020 at 07:11 AM.
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