Q: Need to pass smog check

asked by on September 30, 2016

I had bought a 04 KIA about a month ago, needed to register it so I took it to get a smog check and it failed, saying it was catalyst system. I'm wondering how to fix this. I've since driven it a lot of miles, the check engine hasn't come on once, it doesn't overheat, or misfire at all... The gas milage is good or it seems to be. It started making a ping noise but it was the oil, which the computer also didn't give a signal of check oil. It doesn't seem to be burning oil, I'm not sure what to do. Please help

My car has 128000 miles.
My car has a manual transmission.

75 Point Safety Inspection Get a Quote

Hi, thanks for writing in. This is likely an issue related to the catalytic converter which may be the converter itself or the O2 sensor which is a sensor that monitors the productivity of the converter as it converts toxic exhaust gases into less harmful pollutants prior to expelling them out of the exhaust into the atmosphere. When either of these are not functioning properly, this will cause the car to fail the emissions or smog test.

Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs so you can pass your smog check!

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

What others are asking

Temperature gauge rises when stopped

It sounds like there may be a problem with your cooling fan, particularly the fan clutch. The fan clutch has a mechanism, that based on the temperature of the engine, will either let the fan spin faster or slower. When...

RPM fluctuates, car jumps at speed decrese

This sounds like a shifting issue. The transmission needs to select the proper gear based on how it is adapted when you come to a stop. If the shift is delayed, then the load on the engine will momentarily...

Which ignition coil is connected to my 4th cylinder on my 2004 Kia Sedona

Cylinder number 4 is the coil over cylinder number 4 and is the middle cylinder on the back side of the engine.

Engine shaking and strange noise from the engine bay, also weird rpm at start up

Hello there, a few possible items can cause a similar noise to what you describe. Most likely it is an engine misfire, fuel pump problem, worn out fuel filter, dirty idle air valve (which you may be able to clean),...

The car won't start after the gas is put in

Hello. Most of the time, if your car suddenly will crank and not start after fueling, it is because of a failed fuel pump. The fuel pump in the fuel tank is kept cool with the fuel in the tank....

brake system

Hello. We will be happy to assist you. The brake pedal being lost is likely related to a hydraulic leak and the brake pedal being hard might be related to a faulty brake booster. When changing the ABS pump the...

Wipers barely move

There are two things that come to mind. The wiper arms are installed in the wiper arm transmissions via a cone shaped driver. If the wiper arm is loose, it will get pushed up the driver and not turn with...

Car wont turn over.

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the...

How much do you charge for the starter replacement on 2004 honda accord 2.4

In order to replace the starter on this engine the intake manifold need to be removed. It is recommended to replace intake gaskets at the same time the starter is replaced. There has been reports of the incorrect starter is...

Related articles

The Best Used Cars to Buy If You're a Teacher
If If you are a teacher, probably foremost on your mind is getting to school on time. You would also probably like a used car that is easy on gas and not terribly expensive, and will hold your gym gear...
Should I Get a Smog Technician License?
Getting your smog technician license can help you gain more experience as a mechanic, while also earning some extra cash.
How Do Sensors Get Dirty or Damaged?
Car sensors measure and relay vital information to the ECU. Some sensors can get dirty from normal use, or fail if the car overheats or has a problem.