1998 Mercedes-Benz E320 Q&A
1998 Mercedes-Benz E320 Question: Under body rattle/pinging when car is in drive.
Have the catalytic converter checked as it may be broken. You can raise the car (use appropriate safety measures when under a car) and firmly tap on the catalytic converter, if it's your noise you'll here it every time you tap the converter with your hand. Be sure the exhaust system is cold, you don't want to burn your hand. - Mercedes Connexion
Don't take to dealer ,its the heat shield rattling ,u could take to local shop ,they strap it up or just discard ....or a muffler shop or me but I'm to far away..... Dealers going to hose you ,tell you ,you need the world . I think if it was a bad catylitic converter ,it would set check engine light.. - asksteevies