depends on what type off knocking it is if its a loud one that you can hear while standing outside the car: u need to get a tune up!!! it could just be a loose spark plug or just in need off an oil change really bad.. hope this helps you...
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
When a 1998 Chrysler Sebring makes noise while shifting the transmission should undergo a fluid change. Dirty fluid can cause hard shifting. The engine should also be given a diagnostics test to see if all the sensors are functioning correctly.
replace door latch
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Could be a wheel bearing
Power Steering?
Check the fluid first
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
Could be a faulty relay!
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
you may have a rod knocking and you need to take it to a shop asap
Typically, a knocking noise when to use your brakes in the car is caused by your brakes wearing down. This means you need to get them checked out and repaired.