2017 Lexus RX350 Smells Like Gas

Identifying Potential Causes of Gas Smells in Your 2017 Lexus RX350 and Essential Safety Measures

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
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40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2017 Lexus RX350 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 Lexus RX350 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 2017 Lexus RX350?

When dealing with a gas smell in your 2017 Lexus RX350, it's essential to approach the diagnosis methodically, starting with the simplest potential issues before moving on to more complex ones. Begin by inspecting the vehicle for any visible fuel leaks, as this is often the most straightforward cause. Next, check the gas cap to ensure it is properly sealed; a loose or damaged cap can easily allow gas fumes to escape. If these initial checks do not reveal the problem, consider having a mechanic examine the fuel injectors, as a faulty injector can contribute to the odor. Additionally, scanning for error codes using a diagnostic scanner can provide insights into any underlying issues with the fuel system or emissions. If necessary, inspect the evaporative emissions system and the exhaust system for leaks, as these can also lead to a gas smell. By following this structured approach, you can effectively identify and address the source of the gas odor in your vehicle.

What are the common causes of a gas smell in a 2017 Lexus RX350?

When you detect a gas smell in your 2017 Lexus RX350, it's crucial to investigate the issue thoroughly, as it can stem from several common problems. One of the primary culprits is fuel leaks, which may occur due to a damaged fuel line or a faulty fuel injector, both of which can be inspected visually for signs of wear or damage. Additionally, the evaporative emissions system can contribute to the odor; components like the charcoal canister or purge valve may malfunction, leading to fuel vapors escaping. Another simple yet often overlooked cause is the gas cap; if it is loose, damaged, or missing, it can allow fuel vapors to escape, creating a noticeable smell inside the vehicle. Furthermore, issues with the exhaust system, such as leaks or a damaged catalytic converter, can also result in a gas odor in the cabin, necessitating a closer examination of these components. Lastly, engine problems, including a rich fuel mixture or malfunctioning sensors, can lead to incomplete combustion, producing a gas smell. Addressing these issues promptly is essential for safety and to prevent potential hazards associated with fuel leaks or emissions problems.

How urgent is it to address a gas smell in a 2017 Lexus RX350?

Addressing a gas smell in your 2017 Lexus RX350 is of utmost urgency due to the serious safety hazards it presents. Gas leaks can lead to catastrophic events such as fires or explosions, particularly if the source is a compromised fuel system. Moreover, inhaling gas fumes poses significant health risks, including dizziness, headaches, and nausea, which can escalate to more severe health complications with prolonged exposure. Ignoring this warning sign not only jeopardizes your safety but can also result in further damage to your vehicle, leading to expensive repairs down the line. Therefore, it is essential to take immediate action by consulting a qualified mechanic or contacting your dealership to diagnose and resolve the issue, ensuring both your safety and the longevity of your vehicle.

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2017 Lexus RX350 Gas Smell: Causes & Repairs | RepairPal