Skip the auto shop - Our mechanics make house calls

Q: Check Engine light is not on

asked by on

The Check Engine light is not on. However, when I took my car in for an inspection, the inspector said I needed to replace the catalytic converter/exhaust manifold because he said my vehicle made a noise when I pressed the accelerator. I don't see any drop in fuel mileage and do not detect any weird smells. It only makes the noise when I accelerate, and doesn't make any when going regular speed.

A: The catalyst inside of the converter can br...

The catalyst inside of the converter can break away and cause rattling noises in the exhaust, especially on acceleration. Over time the catalyst material can break apart and cause partial plugging of the exhaust. If the catalyst is no longer able to convert hydrocarbons, then it is entirely possible that a fault for catalytic converter efficiency will be stored. Because the catalytic converter is an emissions device, you may be required to have it repaired even it if is giving you no issues depending on your local statutes. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will be able to inspect the exhaust noise and perform the necessary repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: Constant humming when above 35 mph

With less than 50,000 miles on your 2013 Jeep Patriot, a constant humming above 35 miles per hour is a concern. My first guess would be wheel bearings (like you checked), or perhaps a disc brake pad that was stuck....

Q: What does the SRS indicator on the dash mean?

Your air bag system is technically called the Supplemental Restraint System (SRS) and you’ll see that abbreviation on each air bag cover, as well as a couple of lights on the dash. The main SRS indicator looks like a person...

Q: What could be wrong with my vehicle? It stalled on the highway.

Hi, first task is to check for the problem codes that are setting the Check Engine Light. Since you have a "hard stop" failure, this become even more important. First level isolation is to see if you have spark, or...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.