Skip the auto shop - Our mechanics make house calls

Q: Bad catalytic converter

asked by on

I got a reading from auto zone about a bad catalyst but I kept on driving by putting cataclean in my car. Now my car is just smoking a lot from the engine.

My car has 157000 miles.
My car's transmission is unknown to me.

A: Hello. Typically using chemicals to solve a...

Hello. Typically using chemicals to solve a catalytic converter issue will only prolong the issues from getting worse. These products are not necessarily intended to be used as a fix, but as an additive to an engine that is working well. This brand in particular advertises as a catalytic converter and fuel system cleaner. At this point you are going to want to start from scratch. The first step is to find out why the engine is smoking. This may have been why you were receiving a code about the catalytic converter in the first place. That is hard to tell without knowing what that original code was. While a clogged catalytic converter can cause the engine to produce smoke, only further testing can associate the two symptoms. You may want to have the vehicle inspected by a technician.

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: Engine died when I parked, as if it was turned off. It will turn over, but won't start. Could it be my MAF sensor?

Hi there. First check the transmission position sensor to see if the wiring harness has a short to ground or the sensor is failing. This sensor will cause the engine to shut off in the event that the computer...

Q: Check Engine light; catalytic converters failing

Hi there. It sounds like you have a few issues going on here. If the catalytic converters are failing, then the converters will need to be replaced. They tend to either fail and become clogged causing a loss of engine...

Q: Two questions

Brake pads cannot simply be changed without also either re-surfacing the brake rotors or installing brand new rotors. In addition, the sliding pins must be removed from the caliper torque plates and thoroughly cleaned and re-installed. Hopefully, the calipers are...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.