2019 Mazda 6 Smells Like Gas

Identifying Potential Causes of Gas Smells in Your 2019 Mazda 6 and How to Address Them

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Reviewed by
Bo Fader
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 2019 Mazda 6 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 2019 Mazda 6 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 steps should I take to diagnose the gas smell in my 2019 Mazda 6?

When faced with a gas smell in your 2019 Mazda 6, it's essential to adopt a methodical diagnostic approach to identify the source of the issue. Start by checking for visible leaks beneath the vehicle, as any dripping fuel or wet spots can indicate a problem in the fuel system. Next, inspect the fuel cap to ensure it is securely tightened, as a loose or damaged cap can lead to gas odors. Move on to examine the fuel lines and connections for any signs of wear, such as cracks or leaks, which could contribute to the smell. Additionally, take a close look at the fuel injector for any leaks that might be present. Don’t forget to inspect the fuel tank itself for any damage that could be causing the odor. It's also wise to check the evaporative emissions control system, as issues here can lead to gas smells as well. If, after these checks, you are still unable to pinpoint the source of the gas smell or suspect a more serious issue, it is advisable to consult a qualified mechanic for a comprehensive inspection. This step-by-step approach not only helps in identifying the problem but also ensures your safety while working on your vehicle.

What could be causing a gas smell in my 2019 Mazda 6?

If you're detecting a gas smell in your 2019 Mazda 6, it's crucial to investigate the underlying causes to ensure both safety and vehicle performance. One of the most common culprits is a fuel leak, which can stem from damaged fuel lines, faulty fuel injectors, or issues with the fuel tank itself. Additionally, a loose gas cap can lead to vapor escape, so always check that it is securely tightened after refueling. Another potential source of the odor could be a malfunction in the evaporative emissions system, designed to manage fuel vapor release. Furthermore, an exhaust system leak, particularly near the engine compartment, may allow gas fumes to infiltrate the cabin. Lastly, overfilling the gas tank can result in fuel spillage, contributing to the smell. If you notice any of these signs, it’s advisable to conduct a thorough inspection or consult a qualified mechanic to diagnose and rectify the issue promptly.

How urgent is it to address the gas smell in my 2019 Mazda 6?

Addressing a gas smell in your 2019 Mazda 6 is not just a minor inconvenience; it is a pressing safety concern that requires immediate attention. The presence of gasoline fumes can indicate a fuel leak, which poses a significant fire hazard and increases the risk of explosion, particularly if the leak occurs within the fuel system. Additionally, inhaling gasoline vapors can lead to serious health issues, including dizziness, headaches, and respiratory problems. Ignoring this warning sign can result in more severe damage to your vehicle, leading to costly repairs down the line. Therefore, it is crucial to take action as soon as you detect a gas smell, ensuring both your safety and the longevity of your vehicle.

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