Lexus IS 350: Common Faults & What to Watch For

Lexus has long held a formidable reputation for building some of the most reliable vehicles on the market, and the IS 350, particularly models from 2014 onwards, is often lauded for its robust engineering and ability to surpass the 200,000-mile mark without significant mechanical distress. However, it's a universal truth in the automotive world that no car is truly perfect. Even a luxury saloon as well-regarded as the IS 350 can develop common issues over time. Understanding these potential pitfalls is crucial for current owners and anyone considering acquiring one of these fine machines. This guide aims to shed light on the specific problems you might encounter, helping you identify symptoms, understand their causes, and know what steps to take.

Fuel System Foibles: Odours, Leaks, and Pump Failures

While the Lexus IS 350 is a paragon of luxury and performance, its fuel system can occasionally be a source of concern. Issues such as persistent fuel odours, visible leaks, and even a failing fuel pump have been reported by owners. These problems, while not always catastrophic, demand immediate attention due to their potential impact on safety and vehicle performance.

Unwelcome Fuel Odours

A strong smell of petrol, either inside or outside your IS 350, is a clear red flag. This often points towards a fuel leak, even if you can't see any puddles on the ground, as petrol tends to evaporate quickly. Several factors can contribute to this unpleasant and potentially dangerous issue. Always ensure your fuel cap is securely tightened after refuelling. Beyond the obvious, a clogged fuel filter can impede proper fuel flow, leading to system pressure irregularities. Problems with the EVAP (Evaporative Emission Control) system, which captures fuel vapours, or even issues with the catalytic converter, can also manifest as fuel odours if they are faulty or blocked. Ignoring these smells is never advisable, as they indicate a breach in a critical system.

Concerning Fuel Leaks

Moving beyond just the smell, actual fuel leaks present a more direct hazard. A notable culprit in some IS 350 models has been the deterioration of the diaphragm within the pulsation fuel dampers. Over time, this component can develop cracks, leading to petrol seeping out. This specific issue was significant enough to prompt Lexus to issue a recall in June 2016 (NHTSA Campaign Number: 18V432000), affecting certain IS 350 vehicles. Given that fuel leaks pose a serious fire hazard, any indication of such an issue, whether through smell or visible drips, necessitates immediate inspection and repair by a qualified mechanic. Swift action is paramount for your safety.

The Peril of a Failed Fuel Pump

The low-pressure fuel pump in the Lexus IS 350 is another component that has shown susceptibility to failure. A malfunctioning fuel pump can lead to a range of performance issues, from subtle annoyances to complete vehicle immobilisation. Common symptoms include a noticeable whining noise emanating from the fuel tank, difficulty starting the car, engine sputtering, a loss of power, or even sudden surges in acceleration. The serious nature of this issue, particularly its potential to cause unexpected power loss while driving, led to multiple recalls by Lexus. Affected models were recalled in January 2020 (NHTSA Campaign Number: 20V012000) and again in November 2020 (NHTSA Campaign Number: 20V682000). If you experience any of these symptoms, a professional diagnosis of your fuel pump is highly recommended.

Airbag Anomalies: A Critical Safety Concern

Airbags are arguably one of the most vital safety features in modern vehicles, designed to protect occupants in the event of a collision. Consequently, any issues related to the airbag system in your Lexus IS 350 must be addressed without delay. The primary concerns with the IS 350's airbags have revolved around the driver and passenger inflator modules, specifically the risk of inflator ruptures.

These serious flaws have triggered a series of recalls by Lexus, highlighting the manufacturer's commitment to addressing potential dangers. The core problem often involves the propellant degradation within the inflator, exacerbated by excessive humidity and intense temperature cycles, which can lead to the inflator exploding. Such an event can propel metal fragments into the vehicle's cabin, risking severe injury or even fatality to the occupants. The recall history for the IS 350's airbags underscores the gravity of these issues:

• May 2016 (NHTSA Campaign Number: 16V340000): Recalled due to potential airbag inflator explosions.
• January 2017 (NHTSA Campaign Number: 17V006000): Another recall concerning potential airbag inflator explosions.
• January 2018 (NHTSA Campaign Number: 18V024000): Further recall for the same risk of airbag inflator explosions.
• January 2019 (NHTSA Campaign Number: 19V005000): Focused on faulty front passenger airbag inflators.
• October 2019 (NHTSA Campaign Number: 19V741000): Pertaining to faulty driver airbag inflators.

It is imperative for owners to check if their vehicle is affected by any outstanding recalls and to have any necessary repairs carried out promptly. Ignoring airbag warning lights or recall notices is a risk no driver should take.

Brake System Blips: Ensuring Stopping Power

The braking system is fundamental to your vehicle's safety, and the Lexus IS 350, like any car, can experience a range of brake-related issues. These can manifest as unusual noises, changes in pedal feel, or compromised stopping performance. Awareness of these signs can help you address problems before they escalate.

Grinding Noises and Vibrations

If you notice a grinding noise or excessive vibrations when applying the brakes in your IS 350, it's a clear signal to investigate immediately. While some owners have reported that high-friction Textar brake pads can produce a slightly louder noise when releasing the brakes, genuine grinding usually indicates a more significant problem. This could be due to severely worn brake pads, meaning the metal backing plates are rubbing against the rotors, or it might be something as simple as a foreign object lodged between the brake pads and calipers. Regular inspection of your brake pad life is essential to prevent such issues.

Brake Actuator Issues

Problems with the brake actuator are not uncommon across various newer Lexus models, including the IS 350. This critical component manages the hydraulic pressure within the braking system. Symptoms of a failing brake actuator can include an increase in brake pedal pressure, a noticeable delay in braking response, unusual popping or clicking sounds when the pedal is pressed, the illumination of brake warning lights on the dashboard, or, in severe cases, a complete loss of braking power. Given the actuator's vital role in your vehicle's ability to stop, any indication of its failure warrants immediate professional attention and replacement to maintain the highest level of reliability and safety on the road.

Warping Brake Rotors

Brake rotor warping is a common issue, particularly in high-performance vehicles where aggressive braking is frequent. While not all IS 350 models are performance-oriented, any can suffer from this problem. Warped rotors typically cause a pulsating sensation through the brake pedal or steering wheel when braking, and can lead to reduced braking efficiency. This issue is often attributed to improper installation or a lack of a proper "bed-in" procedure, which helps to evenly transfer friction material from the pads to the rotors. Ensuring correct installation and following manufacturer recommendations for bedding in new brakes can help mitigate this problem.

Brake Slide Pin Setbacks

In older Lexus IS 350 models, and occasionally in some newer ones, the front and rear brake slide pins can fail, necessitating replacement. These pins allow the brake caliper to move freely and clamp down on the rotor evenly. When they become corroded or are not adequately lubricated, they can seize, leading to uneven pad wear, reduced braking performance, and sometimes persistent squealing or grinding noises. Regular inspection and lubrication of these pins during brake service can prevent premature failure.

Electrical and Equipment Quirks

Luxury saloons like the Lexus IS 350 are brimming with advanced technology, designed to enhance both safety and convenience. However, with increased complexity comes a higher chance of electrical or equipment-related gremlins appearing.

Electrical System Peculiarities

Owners have reported various electrical issues, including problems with systems like Destination Assist and Safety Connect, which are designed to alert emergency services in the event of a crash. While these are critical for safety, their malfunction can be concerning. More common electrical annoyances include central locking issues, where individual doors may refuse to lock or unlock remotely. This can often be traced back to a low key fob battery, a faulty solenoid, a blown fuse, or even issues with the wiring. Another reported electrical glitch is the airbag warning light illuminating without an apparent reason, which, given the critical nature of airbags, should always be investigated promptly by a specialist.

Equipment-Related Annoyances

While usually sporadic, certain equipment issues have been noted by IS 350 owners. The dashboard material, for instance, has been cited by some as being overly prone to scuffing, advising careful cleaning with a fine cloth. Wiper problems, such as them operating too slowly or failing entirely, have also surfaced, often linked to shorting wiper relays. Perhaps the most alarming, though thankfully less common, equipment issue is the sunroof shattering without any apparent cause. This phenomenon, while rare, is not exclusive to Lexus and has been observed across the automotive industry. Despite its rarity, it represents a significant safety and repair concern.

Steering System Snags: Maintaining Control

The steering system is paramount for vehicle control and driver confidence. While generally robust, the Lexus IS 350 has had a few reported steering-related complaints that warrant attention.

Some owners have described the steering as pulling to one side, or feeling "notchy" and "grabby," particularly when navigating corners. Another common complaint involves the steering wheel momentarily becoming heavy for a few seconds before returning to its normal feel. Both of these symptoms often point towards issues within the power steering system. The power steering pump is a known component that can fail in many vehicles, and these specific complaints have been directly associated with its malfunction. However, it's important to note that the entire power steering assembly could be the culprit, potentially requiring a more extensive repair or replacement to restore full and precise control of your steering.

Advanced Driver Assistance Systems (ADAS) Annoyances

Modern vehicles increasingly rely on ADAS to enhance safety and convenience. While these systems are invaluable, their complexity can sometimes lead to unexpected behaviour or malfunctions. The Lexus IS 350's ADAS suite is generally effective, but some owners have reported instances where these systems can be overly assertive or disengage without clear reason.

Lane Keep Assist Issues

The lane-keep assist feature, designed to help the vehicle stay centred within its lane, is a staple in contemporary cars. However, some IS 350 owners have reported instances where this system might disengage unexpectedly or, conversely, tug the car towards the centre of the lane even when the driver is intentionally attempting a lane change. While potentially annoying, these issues can often be resolved through a simple software update or system reset by a qualified technician, reinforcing the importance of regular software maintenance.

Adaptive Cruise Control Challenges

Adaptive cruise control is a highly beneficial feature, especially for drivers who frequently navigate motorways or find themselves in stop-and-go traffic. In the Lexus IS 350, common issues with this system include it disengaging unexpectedly or failing to activate altogether. Similar to lane-keep assist problems, these adaptive cruise control glitches are frequently resolved by performing a system reset or updating the software. This highlights how crucial software integrity is for the optimal functioning of these advanced systems.

Preventative Measures and General Advice

While no car is immune to problems, a proactive approach to vehicle maintenance can significantly mitigate the likelihood and severity of issues. For your Lexus IS 350, regular servicing according to the manufacturer's schedule is paramount. This includes routine checks of fluid levels, brake wear, tyre condition, and electrical systems. Paying attention to any unusual noises, smells, or changes in driving dynamics can help you catch problems early, often before they become expensive or dangerous. Investing in preventative maintenance is always cheaper than reactive repairs.

For any concerning symptoms, especially those related to the fuel system, brakes, or airbags, seeking a professional diagnostic is non-negotiable. Qualified Lexus technicians have the specialised tools and knowledge to accurately identify and resolve complex issues, ensuring your vehicle remains safe and reliable for years to come.

Frequently Asked Questions (FAQs)

Q1: Is the Lexus IS 350 generally reliable despite these issues?

A1: Yes, the Lexus IS 350 (2014-present) is widely considered one of the most reliable luxury saloons on the market. The issues highlighted are common problems that can arise with any vehicle over time and mileage, rather than indicators of inherent unreliability. Lexus's strong reputation for durability holds true for the IS 350, with many models easily surpassing 200,000 miles when properly maintained.

Q2: How can I check if my IS 350 is affected by any recalls?

A2: You can check for open recalls on your specific vehicle by visiting the official Lexus UK website or the DVSA (Driver and Vehicle Standards Agency) recall checker, and entering your vehicle's VIN (Vehicle Identification Number). It's crucial to address any outstanding recalls promptly, as they often pertain to safety-critical components.

Q3: What should I do if I smell petrol in or around my car?

A3: If you smell petrol, especially a strong odour, you should immediately and safely pull over, turn off the engine, and avoid driving the vehicle. Contact a recovery service or a trusted mechanic to have the car inspected. Do not ignore petrol smells, as they can indicate a dangerous fuel leak and a potential fire hazard.

Q4: Are the brake issues common across all IS 350 models, or only specific years?

A4: Brake issues like grinding noises, warped rotors, and slide pin problems can occur across various years of the IS 350 (2014-present). While some issues, like slide pin failures, were more noted in earlier generations, they can still manifest in newer models due to wear and tear, driving style, or maintenance history. Regular brake inspections are key.

Q5: Can I fix ADAS issues like Lane Keep Assist or Adaptive Cruise Control myself?

A5: While some ADAS issues can sometimes be resolved by a simple system reset (as described in your owner's manual), it's generally recommended to have these systems diagnosed and repaired by a qualified Lexus technician. They have the necessary diagnostic tools and software to accurately identify the root cause and ensure proper calibration, which is crucial for the precision and safety of these advanced features.

Conclusion

Even a marque renowned for its exceptional reliability like Lexus isn't immune to the occasional common problem, and the IS 350, as excellent as it is, serves as a prime example. From the critical safety concerns of airbag recalls and fuel system vulnerabilities to the more routine issues affecting brakes, electrical components, and steering, being informed is your best defence. Understanding these potential challenges allows you to be more vigilant, recognise symptoms early, and take prompt action.

By staying proactive with your vehicle's maintenance and addressing any warning signs without delay, you can ensure your Lexus IS 350 continues to deliver the smooth, luxurious, and dependable driving experience it's known for. Knowledge is power, and when it comes to your vehicle, being prepared can save you a lot of headaches and keep you safely on the road. Happy driving!

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