Skip the auto shop - Our mechanics make house calls

Q: P0420 code and dash lighs on

asked by on

The dashboard in my car shows check engine light and VSC light illuminated, along with the P0420 error code. I soon have to take the emissions testing so I would like to get this fixed, Could you please tell me if this is a serious issue and if it is going to be expensive to fix it? Thank you in advance.

A: The vehicle stability control (VSC) light a...

The vehicle stability control (VSC) light and code P0420 are for two different problems.

The VSC system would need to be tested for codes for that system.

The code P0420 is for the O2 sensor or problem with a catalytic converter problem and would need further testing of the sensor to see what is the cause of the code.

Only further diagnosis of the Check Engine Light can narrow the problems down for you.

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: Reading P2096/P2098/ the past these have came up but are not clearing this time.

The P2096 and P2098 codes are for both of the downstream oxygen sensors. The P0420 code is for the bank one catalytic converter efficiency. It would be best to have a certified mechanic take a look at the vehicle and...

Q: How to fix the wiring on my alternator?

Hello. The system is burning the wire connector due to the connection being weak and loose. The wire got hot and melted the first time due to a loose connection causing heat build up. You should also check the battery...

Q: P0705 - 2007 Scion tC

Hello and thanks for contacting YourMechanic. The code P0705 means the transmission range sensor circuit has a fault. This is usually caused by the sensor on the transmission failing. After installing the remote start switch, if you did not hook...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...