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Common Car Noises and Their Likely Causes
Clicking noise while turning
Starts faint, gradually becomes more noticeable until very loud
Failed outer CV joint (constant velocity joint) due to torn boot (most likely) or old age
Replace either the whole axle assembly (recommended) or the outer CV joint
Water pump noises
Difficult to diagnose because of water pump's location
Noise usually caused by damage to the bearings in failed water pump
Only cure is replacing it. If possible do it at the same time as a timing belt replacement to cut down on labor costs
Squeak or squeal from an engine belt
Loud, high-pitched squeak or squeal
Belts either need adjustment or replacing
If belts only squeak when damp, they probably just need adjustment. If they squeak constantly, they probably need to be replaced
Exhaust heat shield noises
Rattle that you hear when car is idling
Damaged heat shield
Replace heat shield
sounds like a air leak ,, bank 2 sensor 2 ?? refers to after the catalytic converter ... could be a faulty sensor but more likely an air leak .... even a faulty fuel tank cap seal is enough to cause problems on these systems
If it happens when the steering wheel is being turned left or right when parking, it could be dry tie rod ends. They will have to be replaced and greased up well to get rid of the sound. This happened to my dad's 1998 Ford Taurus.
Sounds like a broken vacuum line,Donna. Makes the computer go crazy.Check all vacuum hoses.A leak that bad you should be able to hear. It might be something else,but I'd check vacuum hoses and connections first. (:^) don-ohio
To address your first problem squeaking brakes aka "brake squeal", is most often casued by one or 2 things: "Pad vibration" or a "low brake warning sensor".
Pad vibation is usually caused by ineffective pad anti-rattling clips & hardware that allow the pads to vibrate at a super fast speed whenever the brakes are applied, thus causing a high pitch brake squeal. To correct this, replace all the pad hardware and anti-rattling clips and make sure you use a quality pad set that has anti-rattling plates attached to the backs of them. Weather conditions do affect brake squeal, that is why it seems to be worse at times.
Low brake warning sensor squeal occurs when your brake pads reach the point of replacement, the sensor attached to the pads scrapes on the rotor which produces a high pitch squealing sound to warn you it's time for new pads.
As far as your second problem goes (a knocking sound), I'll need more information about the problem before I can offer a possible cause (eg. happens on left or right turns, while going over bumps, at high or low speeds, accellerating...).