Skip the auto shop - Our mechanics make house calls

Q: Car won't pass smog due to computer code P0420 - 2006 Volkswagen Rabbit

asked by on

So it should be an O2 sensor or catalytic converter

My car has 71902 miles.
My car has an automatic transmission.

A: This code is related to the catalytic conve...

This code is related to the catalytic converter. As you may know, the catalytic converter is a section of your exhaust system that helps to complete the combustion process when excess unburnt fuel gases pass through the exhaust. Due to the amount and toxicity of the gases that pass through here, this can become clogged from time to time. When this is not working properly or clogged, it can cause the car to not run properly, and as a result will not pass smog for obvious reasons. If you need to have this checked, a certified pro from YourMechanic can come to your car’s location to inspect the code thoroughly and let you know what needs repair.

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: Cat monitor will not run, even though i've done the 55 mph for 5 minutes or more numerous times....

If the cat monitor will not finish and pass after multiple tries then you may have a weak sensor or a catalyst that is bad. I'd suggest having the vehicle scanned to test the O2 sensors for slow or limited...

Q: Alternator needs changed out. What tools is best for this?

To remove the alternator to your vehicle, you will need a serpentine belt tool (or a breaker bar 1/2 inch drive), a 3/8 drive socket set with a ratchet, and a medium side pry bar to help remove the alternator...

Q: Can't shift into reverse 1st or 2nd

Cable adjustment was the correct thing to try, but it won't help much if the ball and socket in the shifter is bad. The VW shifters use a nylon ball and socket joint that can crack, throwing everything off. Try...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.