The light came on the other week and my nephew used the IPNA code reader and light went out after thatr but it has returned. The codes that came up as I understand it were 228, 227, 18 but at the time it was done it said error not present. Where should we start looking for the problem ? a hose ? if so which one is it likely to be rather than replacing the sensor. Advice/help greatly appreciated. (I a hose a location pic. whould be a great help. Geoff