2017 Mercedes-Benz GLA45 AMG Smells Like Gas

Addressing Gas Smells in 2017 Mercedes-Benz GLA45 AMG and Safety Measures

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Reviewed by
Devin Cabugcal
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 2017 Mercedes-Benz GLA45 AMG 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 2017 Mercedes-Benz GLA45 AMG 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 initial steps to diagnose a gas smell in a 2017 Mercedes-Benz GLA45 AMG?

When diagnosing a gas smell in your 2017 Mercedes-Benz GLA45 AMG, it's crucial to follow a structured approach to pinpoint the issue accurately. Begin by visually inspecting the area around your vehicle for any signs of gasoline leaks, such as puddles or wet spots, which can indicate a problem. Next, turn your attention to the fuel lines and connections under the hood; look for any signs of wear, damage, or loose fittings that could be contributing to the odor. It's also important to check that the fuel tank is properly sealed and that the fuel cap is securely tightened, as a loose cap can lead to gas vapors escaping. Additionally, examine the exhaust system for any leaks that might allow fumes to enter the cabin, creating a safety hazard. Finally, utilizing a diagnostic scanner to check for any error codes related to the fuel system can help you identify underlying issues. By systematically following these steps, you can effectively diagnose the source of the gas smell and take the necessary actions to address it.

What could be causing the gas smell in my 2017 Mercedes-Benz GLA45 AMG?

If you're detecting a gas smell in your 2017 Mercedes-Benz GLA45 AMG, it's crucial to understand the common problems that could be at play. One of the primary culprits is a fuel leak, which can occur from damaged components like fuel lines, the fuel tank, or fuel injectors. A faulty fuel injector may also contribute to this issue by causing improper fuel combustion, leading to an unpleasant odor. Additionally, the evaporative emissions system, designed to manage fuel vapors, can malfunction and result in gas smells if there are leaks or blockages. Another potential source is a leak in the exhaust system, which can sometimes mimic the scent of gasoline. Lastly, overfilling your gas tank can lead to fuel spillage, creating a noticeable gas odor inside the vehicle. Addressing these issues promptly is essential for both safety and vehicle performance, so if you suspect any of these problems, consider conducting a thorough inspection or consulting a qualified mechanic for a more detailed diagnosis.

How urgent is it to address the gas smell in my 2017 Mercedes-Benz GLA45 AMG?

Addressing a gas smell in your 2017 Mercedes-Benz GLA45 AMG is not just a matter of convenience; it is a critical safety concern that requires immediate attention. Gas leaks can lead to catastrophic outcomes, including the risk of fire or explosion, which endangers both you and your vehicle. Moreover, the inhalation of gas fumes poses serious health risks, potentially causing symptoms like dizziness and nausea, which can impair your ability to drive safely. Ignoring this issue can also result in significant damage to your engine or fuel system, leading to costly repairs that could have been avoided with prompt action. For those inclined to take a DIY approach, it is essential to first ensure your safety by working in a well-ventilated area and using appropriate protective gear. Begin by inspecting the fuel lines and connections for any visible leaks or damage, and check the fuel tank for signs of corrosion or wear. If you are unable to identify the source of the smell or if the issue persists, it is advisable to consult a professional mechanic to prevent further complications. Taking these steps not only safeguards your health and vehicle but also ensures peace of mind while driving.

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2017 Mercedes-Benz GLA45 AMG: Gas Smell Causes & Solutions