Skip the auto shop - Our mechanics make house calls

Q: Upon starting, loud noise from catalytic converter

asked by on

From how my car is sounding, I am thinking that the problem is probably the catalytic converter. After starting my car first thing, there is a terribly loud noise that sounds like marbles being shaken in a metal jar. Once the car is moving, the sound goes away. The day after this started happening, the exact same symptoms occurred. Finances are tight right now, so I'm wondering how long I can go before having to have this fixed. I would certainly appreciate your diagnosis. Before going to a repair garage, how long can I drive my car safely before I should take it to a mechanic?

A: If the catalyst is broken inside the conver...

If the catalyst is broken inside the converter housing of your 2001 Mercedes E430, then you may get some loss of power due to increased back pressure from partial blockage created in the converter. This can also lead to increased engine temperatures and possible overheating. The engine temperature will need to be monitored while driving, and this issue should be looked as soon as possible to prevent damage to the engine and to ensure that emissions stay within standards. You may want to enlist the help of a mechanic, such as one from YourMechanic, who can inspect the noise and determine the best next action.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What's involved in changing the radiator hoses?

If access is poor from above, you may get a better angle if you raise the vehicle and support it with jack stands to get to things from the bottom. I like to use a mirror to see into hard...

Q: Changing sensor in 1999 Honda Accord with the check engine light on

Of course. I would try the sensor first. They are cheaper. Realize that oxygen sensor systems are part of a complex computer-driven feedback system. It measures the amount of oxygen in your exhaust, then it gives feedback to your computer...

Q: Grinding

If your clutch was recently replaced, you should take it back to the mechanic that replaced it. I do need to point out that replacing a clutch at 35,000 miles is very early. I am wondering what caused your clutch...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...