As we mentioned, these issues range in severity, from a loose gas cap to a serious engine malfunction like spark plug failure. These are the top 5 related issues that usually cause the check-engine light to come on:.
Catalytic converter issues If your catalytic converter fails, your Audi will be unable to convert the harmful gases created by your engine into milder compounds that are less damaging to the atmosphere — this often leads to failed emissions testing. Oxygen sensor failure or malfunction Along with working spark plugs, your engine also requires the proper amount of oxygen. A clogged catalytic converter will cause problems with the vehicle that can certainly lead to an illuminated check-engine light.
The good news is that your Audi specialist will be able to read the code emitted by the light with the proper tools and skills, identifying the converter as the source of the issue.
The exhaust system works by pushing our air out of the system; however, on the other end of the exhaust system is the air intake system , which is responsible for bringing in clean air that is cycled through the exhaust system and catalytic converter eventually. Our cars are made up of hundreds of parts and pieces that can sometimes get a little loose or make noises from time-to-time.
However, if you notice any odd noises that are out-of-the-ordinary, especially for your own vehicle, it should be checked out right away.
If the catalytic converter becomes clogged it can produce a rattling sounds as it attempts to filter air. Engine misfiring can occur for any number of reasons, but it is surely one of the symptoms your car may exhibit if it is unable to filter out the contaminated air through a clogged catalytic converter.
If you have an older Audi vehicle and are required to bring it in for an emissions test , usually passing it is no big deal and you can go on about your day; however, if your Audi is unable to pass an emissions test it could likely be due to a clogged converter. The catalytic converter uses precious metals and high heat to oxidize and reduce harmful emissions, converting them into safer compounds like H2O, CO2, nitrogen N2. The "Italian Tune-Up" is a common fix for a range of automotive problems, including a clogged catalytic converter.
Running a vehicle harder than usual for a few miles e. For example, if you typically fill your vehicle with the cheapest low-octane fuel, try running your vehicle on a few tanks of high-octane fuel.
Adding one gallon of lacquer thinner to ten gallons of gas at your next refuel may also be effective clearing out catalytic converter deposits.
You can try either of these methods in combination with the Italian Tune-Up method. You may need to fix other engine problems in order to solve your catalytic converter problem. A lazy oxygen sensor might falsely indicate a catalytic converter problem, yet not set a DTC for itself.
A technician can determine if the sensor is responding as it should. Other engine problems, such as fuel trim running too rich or too lean, oil or coolant burning, or engine misfire problems could all lead to catalytic converter contamination or premature failure.
Depending on the extent of the damage already done, fixing engine problems might save the catalytic converter from a meltdown. Exhaust leaks are common and can skew oxygen sensor readings without setting other DTCs. Worn exhaust gaskets and corroded flex pipes are two common issues that are significantly less expensive and more effective than replacing a catalytic converter.
Removing and cleaning the catalytic converter is another potential fix. After removing the catalytic converter, use a pressure washer to blast out any contaminants from the matrix. Be sure to flush the unit from both ends. Another way to clean the catalytic converter is to soak it overnight in a combination of hot water and degreaser or laundry detergent.
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