Skip the auto shop - Our mechanics make house calls

Q: Failed smog test

asked by on

The reason my minivan didn't pass the smog test, they tell me, is because the catalytic converter log isn't filled. They told me to drive it on the interstate for an hour between 55-60mph. I did this several times, but still didn't pass the smog test. What do you suggest that I do to solve this problem?

A: Hello. The catalytic converter acts as a fi...

Hello. The catalytic converter acts as a filter for exhaust gasses emitted from the vehicle. This purpose of this is to reduce the pollutants that are expelled into the environment. The first thing you could try is adding a catalytic converter cleaner to your gas. You’ll want to allow this to run through the catalytic converter and see if it passes the smog test. You could also try using a higher grade of gas and this might help your vehicle pass the smog test. If this doesn’t work, it may be necessary to replace the catalytic converter itself. If you are unable to pass the smog test and need to replace the catalytic converter contact a certified technician, such as one from YourMechanic.

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: Car not running after throttle body with IAC valve replacement

Hi, thanks for writing in. I would recommend retracing your steps. You are definitely on the right track. It sounds like you did a good amount of work to your car, and it is likely that something may been skipped...

Q: Rear wheel not turning

If your rear parking brakes were on when you parked the car then it's possible that the parking brake cable or the brake shoes are seized to the brake drum. I recommend having a certified mechanic come and diagnose the...

Q: Service engine warning, MAF code and O2 sensor code, along with check suspension light are turned on

Hello, it sounds like you have quite a few things going on. I am going to do my best to break them down for you. First if the engine is very loud when idling and the belt has...

Related articles

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...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...