Skip the auto shop - Our mechanics make house calls

Q: I had the catalyst converter replaced last year. Now the Check Engine Light is on again for O2 sensor. What do I do?

asked by on

I had the catalyst converter replaced last year but now the check engine light is on again for the o2 sensor and catalyst converter why am i having this issue again with the impala what could possibly be going on to cause emission failure with a fairly new replaced converter?

My car has 72000 miles.
My car has an automatic transmission.

A: You may want to have a professional inspect...

You may want to have a professional inspect the catalytic converter. When the Check Engine Light comes on for this, it does not necessarily mean that the catalytic converter has failed. This may be related to many other things as well such as the O2 sensor making false readings or potentially a rich or lean fuel mixture being caused by something else.

To avoid any unnecessary repairs, I would recommend having one of our mobile experts come out to you to do a proper diagnostic test using a scanning tool to download the car's trouble codes and inspect the catalytic converter.

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: I had a catalytic converter installed in my vehicle in 2013, now I'm being told I need a new one. How long is it suppose to last?

Hello. Most vehicles do not have to have the catalytic converter replaced unless it becomes damaged due to road debris or it overheating severely. With that said, it is possible your car may be running a bit too rich (too...

Q: Very low rpm

Hi there. From the description you have given, I believe you are stating that your vehicle has no power, and you are only able get to 35-50 mph and nothing over 1500 rpm. You also stated vehicle runs great, which...

Q: My car begins a bouncing sensation when braking at higher speeds

Any vibration felt only when the brakes are applied would typically be a brake pulsation. If the brake rotors are warped, you can feel a vibration in different forms depending on which rotors are the issue - front or rear....

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 Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...