2020 Audi S5 Smells Like Gas

Common Causes of Fuel Odors in Your 2020 Audi S5 and Essential Safety Precautions

Find Repair Location
Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
0%
40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2020 Audi S5 smells like gas are the gas cap, the fuel system, or the emissions control system.
  • Gas Cap: A loose or damaged gas cap can cause fuel vapors to escape, triggering the check engine light and potentially affecting fuel system pressure.
  • Emissions Control System: A faulty emissions control system can lead to increased hydrocarbon emissions and trigger the check engine light due to malfunctioning components like the EGR valve or O2 sensors.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Audi S5 smells like gas?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A failing catalytic converter can cause a vehicle to fail emissions tests and turn on the check engine light. The exhaust might have an unusual smell. A restricted catalytic converter can result in a loss of engine power.

» LEARN MORE: How to tell if your catalytic converter is failing

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. The canister may also cause difficulty starting the engine, a rough idle, and poor fuel mileage.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. A fuel tank leak may also cause difficulty starting the engine, a rough idle, and poor fuel mileage. When a fuel tank is simply corroded to the point of failure, the exterior tank condition rarely shows damage. The inside of the fuel tank will be rusted or corroded, and rust flakes or other debris may be floating in the fuel.

For most vehicles, the only symptom will be a check engine light or fuel tank filler cap light illuminating on the driver instrument cluster. This is to signal that there is an evaporative emissions (EVAP) leak. In some situations, the vehicle may take longer than normal to start, or, more rarely, the engine may not start at all. on-board diagnostic (OBD) trouble codes will refer to EVAP system failures such as a small or massive EVAP system leak. Lastly, the powertrain control module may notice a lean running condition, which could even lead to random and infrequent misfires.

What are the potential causes and diagnostic steps for a gas smell in a 2020 Audi S5?

When you detect a gas smell in your 2020 Audi S5, it's crucial to act quickly and methodically to identify the source of the problem. Start by visually inspecting the area around your vehicle for any obvious signs of fuel leaks, such as puddles or wet spots under the car. Next, examine the fuel lines for any signs of wear or damage, as these can often be culprits in fuel leaks. If everything appears intact, turn your attention to the fuel injectors; a malfunctioning injector can lead to an unpleasant gas odor. Utilizing a diagnostic scanner can also be beneficial, as it will help you check for any error codes related to the fuel system that might indicate underlying issues. Additionally, inspect the evaporative emissions system, as problems here can contribute to gas smells inside the cabin. Don’t overlook the exhaust system; a leak can sometimes mimic the smell of gasoline. Lastly, if you suspect that a clogged air filter might be affecting the air-fuel mixture, replacing it could resolve the issue. By following these diagnostic steps, you can effectively narrow down the cause of the gas smell and take appropriate action to ensure your vehicle remains safe and functional. If the problem persists or if you're uncertain about any step, consulting a qualified mechanic is always a wise choice.

What could be causing a gas smell in a 2020 Audi S5?

If you're experiencing a gas smell in your 2020 Audi S5, it's crucial to understand the common problems that could be causing this issue. One of the primary culprits could be a fuel leak, which may stem from a damaged fuel line, a malfunctioning fuel injector, or even a compromised fuel tank. Additionally, issues with the evaporative emissions system, designed to manage fuel vapors, can also lead to noticeable gas odors. Another potential cause is a faulty fuel cap; if it's loose or damaged, it can allow vapors to escape, creating a strong smell inside the vehicle. Furthermore, an exhaust system leak, particularly near the engine compartment, can produce a gas-like odor that permeates the cabin. Lastly, an engine misfire may result in unburned fuel entering the exhaust system, contributing to the gas smell. Addressing these issues promptly is essential for your safety and the vehicle's performance, so consider consulting a qualified mechanic for a thorough inspection and diagnosis.

How urgent is it to address the gas smell in my 2020 Audi S5?

Addressing a gas smell in your 2020 Audi S5 is not just a matter of inconvenience; it is a pressing safety concern that requires immediate attention. Ignoring this issue can lead to severe consequences, including the risk of fire or explosion due to gasoline leaks, particularly in the confined space of your vehicle. Additionally, inhaling gasoline fumes poses significant health risks, with symptoms ranging from dizziness and headaches to more serious long-term health effects. Furthermore, a gas smell often indicates a leak in the fuel system, which can compromise your vehicle's fuel efficiency and potentially cause extensive engine damage if left unaddressed. Therefore, it is crucial to act swiftly and investigate the source of the gas smell to ensure your safety and the longevity of your Audi S5.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2020 Audi S5 Smells Like Gas: Causes & Repairs | RepairPal