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Originally Posted by Dale_K
I'm new to Posches but my other vehicles built within the past 15 years all have knock sensors that detect motor knock and adjust the ignition timing as needed to prevent it. Can anybody confirm whether or not Porsches have knock sensors? Does the 2000 S model like the one I bought a month ago have them?
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Yes the Boxster does have knock sensors and by design your smart ECU will retard the timing to prevent detonation and engine damage. It is a band-aid that should not be relied upon every day but it is there to prevent damage in the event that you put 87 gas in. Performance and mileage will also suffer with retarded timing due to the knock sensor so you won't save any money running cheap gas.