☰
GET A QUOTE

Q: Failed emissions test...need advice

asked by on June 19, 2017

The following diagnostic trouble codes occurred during my emissions test: P0504 Brake Switch A/B Correlation, P0420 Catalyst System Efficiency Below Threshold Bank 1, P0464 Fuel level Sensor a Circuit Intermittent, and P0110 Intake Air Temperature Sensor 1 Circuit Bank. I need advice on what I should do and the services needed to fix these errors.

Recommended Services

Check Engine Light is on Inspection $94.99 - $114.99 Get a Quote
Or For Any Other Auto Repairs Get a Quote

Hi...the codes appear to implicate different vehicle systems. As far as the required services, such will depend on exactly why the particular code has set. For example, resolutions of P0420 range from replacement of the converter to simply bad wiring connections on the oxygen sensor. So, what you need is a diagnostic to track down the exact cause behind each code. I recommend you request a check engine light diagnostic and the responding certified mechanic will get the underlying fault(s) identified, via a specific diagnostic, and resolved in the case of each code. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Hyundai
Sonata
2006
V6-3.3L
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Actuator not opening trunk
Since the trunk lid solenoid is working, it sounds like the latch or actuator needs to be replaced. There are also two ways to open the trunk if the key fob or dash button don't work. Pull the "T" shaped...
Read more
Temperature gauges jumping and fan not running on a 2008 Avenger
Of course, the fans have to work correctly. They might not work for lots of reasons. First thing is to put in a new thermostat. Because, if you've got a stick in thermostat, the engine can get hot, but then...
Read more
After oil change informed that engine was leaking from valve gasket cover.
Valve cover gasket leaks are located by visual inspection and are usually one of the easier leaks to confirm the source of, since they are high up on the engine. It would't hurt to wash it off, especially if it's...
Read more
Well the check engine light is blinking. A track light keeps coming on and there seems to be loss of power. Engine running rough.
Hello. If the check engine light is flashing then that typically means that there is a cylinder misfire. This can be caused by a bad spark plug, spark plug coil, or fuel injector. It can also be caused by something...
Read more
Car vibrating/shaking when idling
This may be related to an idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) or potentially low fuel pressure. The idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) monitors air intake as it is mixed with fuel prior to being injected into the motor. When this...
Read more
My Check Engine Light is on - code P0430
Hi there. If you are getting this code (https://www.yourmechanic.com/article/p0430-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-2-by-spencer-clayton) along with a loss of power, it usually means that the catalytic converter is failing. When it fails internally it begins to clog the exhaust which will cause the lack of...
Read more
I bought a new battery and my car worked at first, but now it won't even start?
This may be a sign of a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns...
Read more
What could be wrong with my truck?
When you have a vehicle that is 27 years old it can be most anything causing the vehicle to hesitate. Depending on the engine you have you may have a sensor issue that is not working correct or a fuel...
Read more
Hi I have a chevy j1 2010 model. My remote is jamed and I can't start my car. It shuts off my fuel how can I reset my alarm to start the vehicle.
Hi there. The remote will need to be repaired or replaced and then the new remote would need to be programmed to match the computer system in your vehicle. Then your vehicle will start up properly. If you need further...
Read more

Related articles

A Buyer’s Guide to the 2012 Hyundai Sonata Hybrid
When When Toyota first introduced the Prius, the idea seemed to be that all hybrids and electric cars had to have their own specific models and that they couldn’t look like normal cars. A lot of consumers weren’t too thrilled...
Read more
The Best Used Cars to Buy If You’re Over Six Feet Tall
While While shorter than average drivers can have a tough time finding the right car, it’s equally hard for taller drivers, perhaps more so. If you’re feeling squished, or have to hunch over the wheel to drive, then you’re not...
Read more
The Best Used Cars to Buy If You Have 3 or More Kids
If If you have three or more kids, you could probably get by with a mid-size sedan if all you want to do is take them from Point A to Point B. Realistically, though, having kids means music lessons, athletics,...
Read more

Browse other content

Maintenance
Cities
Estimates
Services