My mechanics put this down to MAF (Mass Air Flow Sensor) according to his scanner and diagnostics, error kept occuring after attempting to clear it. My air filters were replaced last service so it cant be them contaminating the MAF.

I've ordered a new MAF for $40 including delivery from eBay, I was quoted $165 for a used and $500 for a new one! Thank god for eBay.

I will let you know if this resolves the problem and removes the error code. I am also going to run Toyota Injector Cleaner fluid through the fuel to make it run like new again.