1. Check the condition of the exhaust system from the engine to the end section. Perform the check on a cold engine, at least 1 hour after the trip. To check, it is best to raise the engine to provide unhindered access to all parts of the system.
2. If there is no lift, raise the vehicle and place it on stands.
3. Check the exhaust pipes and connections for signs of exhaust gas leakage, severe corrosion and mechanical damage. Check that all brackets and exhaust pipe supports are secure and intact. Exhaust leaks can usually be detected by soot deposits.
4. Strong knocks from the exhaust system are usually caused by unreliable fastening of the exhaust pipes to the brackets and supports. Shake pipes with mufflers. If the pipes and mufflers come into contact with the suspension parts or the underbody, replace the fasteners, or if possible, separate the pipes and rotate them relative to each other to ensure sufficient distance from other parts.