Ford Focus My ford Focus 03 reg has developed a noise coming from the driver side the noise starts when i accelerate and stops as i ease off the accelerator.

Exactly the same problem.

2000-2003 Focus vehicles may exhibit a noise from the right halfshaft support bearing.

Due to the way the driveshaft is designed there is central bearing on the the shaft. On the front drivers side it has the tendency to hum at speeds over 40mph. This is the first sign that is the bearing is going. According to Ford it can be quite common in cars of 50-60k plus. If you don't notice the hum (I didn't really) you will eventually start to get a ticking/crackling noise at speed, which will gradually get worse and take less travel time to get going. Eventually the bearing will just seize, so it is worth getting it sorted.

Unfortunately even private mechanics will have to source the bearing, which isn't cheap, so it will cost around 125-150 quid at the garage to fix. It can be a pretty fiddly job, as the whole driveshaft needs to come out (not easy in high mileage cars due to build up of grime etc), so I wouldn't attempt to replace at home unless experienced.

Sounds like it could be your driveshaft bearing

If the noise increases and decreases with speed, reccomand checking the hub bearings or check the tires for wear. if it is chopping in the tire it could be a alignment problem. Best recommend full inspection of the front drive assemblly.

O3 ford foucus car key will go in ignation but wont turn

Check your U joints front and back. Put the car in park. Grab your driveshaft under the car and shake it. If it loose and has some play in it, you need to change your U Joints. And it can be poor tires too. Alot depends on the sound itself. Type of sounds help diagnose your problem.