Happy Fathers Day guys, having a reoccurring service light on my 06 MCS.Check the code PO326 which according to the manual it's the knock sensor.But I can't find the problem.Have checked the plugs an coolant,everything looks normal.Any help would be greatly appreciated.Thought it may be the fine quality gasoline we have in Cali. Thanks for the info in advance.

 

I would guess that the code "Knock Sensor 1 Circuit Range/Performance (Bank 1 or single sensor)" means there's something wrong with the sensor itself. Good luck.