Potential Reasons Your Audi's Check Engine Light is On

The check engine light is among those car signals that can make any driver uncomfortable. This small light on your Audi’s dash means there is a fault in one of your car’s systems but it doesn’t always indicate a major issue. Knowing the causes of this warning would assist in fixing the problem swiftly and effectively. Here are the possible causes of the CEL illumination in your Audi and how to fix them.

Reasons Your Audi’s Check Engine Light May Come On

Faulty Gas Cap: The check light coming on can be caused by several issues, but one of the most basic and easily correctable is a loose or damaged gas cap. The gas cap covers the fuel system and also plays a role in regulating pressure inside the fuel tank. If it is not tightened in the right way or if it is worn out, it will trigger the check light. To correct this, ensure that the gas cap is tightly screwed back on after refueling your Audi. If the light persists and you’re sure the gas cap is the problem, then it is recommended that it be replaced.
Oxygen Sensor Issues: There are several oxygen sensors in your Audi that are involved in monitoring the exhaust emission and the air-fuel mixture of the engine. If one of these sensors goes bad, it can set off the CEL. An oxygen sensor that is not functioning properly can cause a car to run poorly and use up more fuel than it should. To address this problem, you will have to swap the defective sensor with a new one.
Catalytic Converter Problems: The catalytic converter is one of the most important parts of the exhaust system of your Audi. It treats the dangerous emissions as it transforms them into less hazardous gasses. If the catalytic converter is faulty or blocked, then the CEL will turn on. Signs that indicate a failing catalytic converter include poor acceleration and strange smells from the exhaust. If this component is blocked, you will need a mechanic to fix or replace it.
Issues with the Thermostat: The thermostat assists in managing the temperature of the engine by allowing the coolant to flow in and out of the engine. If the thermostat is stuck open or closed the engine will overheat or run too cold and the check light will come on. Fixing the bad thermostat can help avoid more damage to the engine and enhance the performance.
Transmission Problems: While not as frequent as the engine problems, the problems with the transmission can also lead to the check engine light being on. Issues like low transmission fluid, slipping gears, or a problematic torque converter can make the light come on. These problems should be diagnosed and fixed by a professional so you can have your Audi run without any problems.
Faulty Ignition Coil: Ignition coil is used to transform the battery voltage to the higher voltage required to ignite the fuel. If an ignition coil is faulty, it may lead to misfiring and the CEL will be activated. These problems can be fixed by replacing the faulty coil and bringing your engine back to proper working condition.
Faulty EGR Valve: The EGR valve assists in minimizing nitrogen oxide emissions since a part of the exhaust gasses is returned to the engine. Sometimes, the EGR valve may be stuck in the closed position, clogged or not functioning properly and this may lead to the check light being on. The solution to this problem is to clean or replace the EGR valve.

You Need A Professional

One of the ways of diagnosing a CEL is through the use of an OBD-II scanner. After detecting and interpreting the cause of the light, you will need a professional to fix the problem so your Audi can be returned to its best performance.

Trusted Audi Repair Specialists in Herndon

Auto Scandia is the best auto repair shop in the area specializing in European and Asian vehicles. Founded over 40 years ago, we cater to Herndon, VA drivers as well as drivers from Sterling, Reston, Great Falls, Chantilly, and Oakton VA. If your CEL is on for any reason, then our Audi specialists will diagnose the cause of the light and proffer the most reliable solution. Schedule your next Audi repair with us now!