Any number of things could cause this. Start with: * Loose items in the trunk * Spare tire not fastened securely * Shocks * Worn suspension components (look for broken / split rubber components) Lastly, all suspension systems have 'limiters' that keep the wheels from traveling too far (hitting the underbody) - if you are hitting large bumps then the system is working as designed.
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Power Steering?
A single knocking noise when braking or turning can be caused by a faulty axle. The cost of replacement is usually around 1,000 dollars.
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.
you may have a rod knocking and you need to take it to a shop asap
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
Running too lean.
your cv boot has torn and needs replacement
Normally caused by worn steering or suspension components.
A knocking/clicking noise when making a turn is a sign of a torn CV boot. In this case it's the driver side boot that is torn.
it's probably a rod knocking
I would check the suspension bushings, if one of them is worn it would cause a knocking noise.