How to Troubleshoot Catalytic Converters

The catalytic converter is a very important part of the emissions control system on your vehicle. It’s usually good for the life of a vehicle, but occasionally it does fail. The best thing you can do is be alert for signs of trouble and head for a service facility if you suspect that the catalytic converter is malfunctioning.

It’s against the law in many states to remove a catalytic converter and run a vehicle without one.

Interior and exterior views of a catalytic converter

• Your vehicle’s fuel efficiency suddenly drops.

• Your vehicle doesn’t accelerate when you step on the gas pedal.

• Your vehicle may refuse to start.

• Your vehicle fails an emissions test.

• The MIL or Check Engine light comes on.

Every car sold in the United States since 1996 has had an OBD (On-Board Diagnostic) II system that tests the catalytic converter (among many other things). If the unit allows too much pollution to escape from the tailpipe, it illuminates the MIL and produces a trouble code that can be read by a technician with what’s called a “scan tool.”

The catalytic converter is sensitive to changes in the contents and temperature of the exhaust gases, so another possible cause for failure is if the cylinder head gasket is damaged, allowing oil or coolant to get into the combustion chamber and be burned in the cylinders. Also, if your ignition system isn’t operating properly, unburned fuel in the exhaust gases can cause the catalytic converter to wear out or break down. This is another good reason for going for tune-ups at specified intervals!

Because the catalytic converter can become extremely hot, it’s important not to park your vehicle over a bed of dry grass or dry leaves, which could catch fire and destroy not only your vehicle but also the surrounding area!

Check here for making a green decision when it comes time to replace your car.