My ford fiesta zetec s 2008 model has a very loud annoying ticking noise coming from the engine starts off soft and get to about 4 thousand revs it gets really bad any ideas what's causing this ?

can be various things.. but i know it sounds daft but have you checked the oil lately?

Personally i suggest you get a mechanic to look at that asap... dont drive it. get it checked out mate otherwise big bill if its the dreaded.

Usually caused by low oil level or pressure.

Check oil filter, dipstick levels and as said above avoid driving except to a garage if the above things are ok.

Thanks guys I have checked oil and its been serviced well from new usually in the engine it needs 35 psi pressure for the oil to circulate round and everything seems normal my O2 sensor recently went and when I went to change it the cap was missing asive it's dropped down into my cat exhaust box I that it was that but can't confirm it but also a know this car has variable timing and may have jumped one tooth causing it to make this clicking noise if anyone has knowledge on this ???