How ti reset service now in porsche cayman s?

Probably Nox too high. Can also be engine too hot. Last time cooling system serviced? Also can be carbon in the combustion chamber ignites fuel too soon. Fuel delivery system and all sensors may be a problem. Bad or corroded connections can contribute to bad behavior of the ECU.

You can try allscanner vcx porsche Piwis Tester II(http://www.aobd2shop.com/wholesale/allscanner-vcx-porsche-piwis-tester-ii-with-brand-new-lenovo-e49al-laptop-3722.html), it is very good!it can read / clear error codes, capture data streams, computer programming matching, component test, maintenance information consultation, site map elements, wiring diagrams, equipped with Lenovo or Dell laptop and genuine software testing that can help you diagnose and programming for all new and old kind of Porsche cars.hope it is helpful to you...

Buy a Chevy

You need scanner to read code and reset.

check relays, switches and grounds

Check engine light on?

Is it a manual or auto? Assuming its a manual, is there an ABS light on? If so or if you hace changed the brake pads recently or even had the tires off or rotated, there could be a problem in the brake pad sensor or abs wheel speed sensor.

Check with Porsche service (your closest dealer) for recalls or TSB (Technical Service Bulletins) related to your concern and check the cayman/boxster owners clubs for similar posts and resolutions.

Hope that helps.

The only way to do this is at a mechanic THey have a hand-held scanner that will check engine codes and reset the light. THe light will go off after certain mileage, or if something sensor wise or electronical failure is happening.

Post your problem on pelicanparts.com in the forum for your model car, great help there.

Jim