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・Fair and transparent pricing

Get a quote

What others are asking

Q: Transmission clicks and jump while shifting in stop and go traffic

Hello. This vehicle has a history of transmission problems. Most of the time it is because the second gear band fractures. When this occurs, it has trouble holding several gears properly and causing shifting issues. It may also be caused...

Q: 2016 Honda Accord service B1 -36

Hello - according to Honda, the "A-36" msg indicates your vehicle needs transmission fluid replacement (3) and differential fluid replacement (6). It is safe to drive your vehicle until this service appointment.

Q: Multiple problems with the car I just purchased

Hi there. I am so sorry that this has happened to you. The Check Engine Light bulb needs to be replaced so that you know when the system sees a problem; you didn't know that you would fail the emissions...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...