Does the Lexus RX350 have a timing chain?

Yes. Across its recent generations, the RX 350 uses a timing chain rather than a timing belt, covering both the 3.5-liter V6 engines and the newer 2.4-liter turbocharged four-cylinder introduced in later years. This means routine timing-belt replacement is not part of normal RX 350 maintenance.

What this means for RX 350 owners

The timing chain is designed to last longer than a belt, but wear can occur in tensioners, guides and related components. Understanding the chain’s role helps buyers know what to expect in maintenance and repairs over the life of the vehicle.

Engine options and timing chain status

Below is a snapshot of RX 350 powertrains by generation and whether they use a timing chain.

• 2007–2015 RX 350: 3.5-liter V6 (2GR-FE) — timing chain driven, with VVT-i.


• 2016–2022 RX 350: 3.5-liter V6 (2GR-FKS) — timing chain driven, with updated chain system and guides.


• 2023–present RX 350: 2.4-liter turbocharged inline-4 — timing chain driven.

In short, every RX 350 model line in current production uses a timing chain rather than a belt. This design choice is consistent with Toyota/Lexus practice for mainstream engines in this vehicle class.

Maintenance and reliability considerations

Because timing chains are generally built to endure longer life, owners rarely face a scheduled timing-chain replacement. Still, components within the chain system can wear and require service as the vehicle ages.

• Routine maintenance does not include a timing-chain replacement; instead, focus on regular oil changes and coolant system care.


• Watch for symptoms such as unusual rattle on startup, ticking noises, or poor engine performance that could indicate a worn tensioner, guide, or chain stretch.


• Important related parts include the water pump and chain guides; many Toyota/Lexus engines drive the water pump off the timing chain, so pump wear can coincide with chain service.

For buyers of used RX 350s, verifying prior maintenance and listening for chain-related noises, especially as mileage climbs, is prudent. A dealer or mechanic can perform a chain-tensioner check and inspect the guides during a thorough pre-purchase inspection.

What to look for during ownership

Beyond timing-chain concerns, owners should maintain oil change schedules, monitor coolant levels, and address any engine warning lights promptly. A well-maintained RX 350 that has benefited from regular service tends to resist chain-related failures, given the chain’s design life is typically aligned with the vehicle’s overall longevity.

Summary

The Lexus RX 350 uses a timing chain across its recent generations, from the 3.5-liter V6 era to the newer 2.4-liter turbo four-cylinder. This arrangement avoids regular belt replacements, though wear in timing-chain components can occur with age and mileage. Regular maintenance and attentive inspection remain essential for long-term reliability.

What is the most common problem with Lexus RX 350?

The most common problem with the Lexus RX 350 is a massive oil leak, specifically from the VVT-i oil line, which can lead to rapid oil loss and potential engine failure, especially in older models like the 2010. Other frequent issues include faulty rain sensors, especially in newer models, resulting in wipers that malfunction randomly. Older model years (2007 and 2010) also show a tendency for airbag warning lights and transmission problems, while some 2016 models experienced rough shifting and transmission issues.
 
This video discusses the 2013 Lexus RX 350's common problems, including oil leaks and other issues: 55scar PROblemsYouTube · Jun 26, 2022
Engine and oil leaks 

• VVT-i oil line leak: This is a recurring issue, particularly in older models like the 2010, where the oil line can burst, causing significant oil loss and potential engine damage if not addressed immediately. 
• Check Engine light: This can be triggered by various engine issues, including problems with the variable valve timing system. 

Electrical and sensor problems 

• Rain sensor malfunction: Both older and newer models have reported issues with the rain-sensing wipers not functioning correctly or stopping randomly. 
• Airbag warning light: This has been reported across several model years, often linked to codes B0111 and B0116 due to issues like faulty sensors or a depleted airbag backup battery. 
• Infotainment system issues: Problems like malfunctioning touchscreens, unresponsive climate controls, and other glitches have been reported, particularly in recent years. 

Transmission and drivetrain issues

• Rough shifting: Some models, such as the 2016, have been reported to have delayed gear shifts and a lack of smoothness.
• Transmission failure: In the 2016 model year, transmission problems were significant enough to cause concerns about long-term reliability. 

Other potential problems

• Spontaneously shattering sunroofs: Though rare, this has been reported in some model years and is a significant safety concern. 
• Body integrity issues: Some older models, such as the 2010, have experienced body-related issues like rattling doors. 
• Steering mechanism leaks: These can be costly to repair. 

Does the Lexus RX 350 have a timing chain or belt?

The Lexus RX 350 uses a timing chain, not a timing belt, for its engine. This means it does not have a scheduled replacement interval like a timing belt does and typically lasts for the life of the engine unless there is a problem. Some older models, like the Lexus RX 330, did use timing belts.
 
This video demonstrates how to identify if your car has a timing belt or a timing chain: 50sYourCarAngelYouTube · Jul 16, 2014

• No scheduled replacement: A timing chain does not require regular replacement at specific mileage intervals.
• Engine durability: The timing chain is designed to last the life of the engine, as long as the engine is properly maintained with regular oil changes.
• Symptoms of a failing chain: If the chain stretches or has an issue, you may notice a check engine light, excessive noise from the timing cover, or the engine may not start.
• Older models: It's important to note that some older models, such as the Lexus RX 330, did use timing belts. The RX 350 uses a timing chain. 

How much does it cost to replace a timing chain on a Lexus RX350?

The cost to replace a timing chain on a Lexus RX 350 can range from approximately $1,500 to $4,000, with the wide variation depending on labor rates, parts quality, and the specific model year. Some sources suggest a DIY cost of $500-$900 for parts, but it's a complex job that typically involves removing the engine. For a 2009 RX 350, one estimate factored in 18.1 hours of labor at $125/hour for a labor cost of around $2,262 alone. 
Factors influencing the cost

• Labor: This is a major part of the cost, as replacing a timing chain is a labor-intensive job. For some models, the engine must be removed, increasing the time and complexity significantly. 
• Parts: The price of the timing chain kit itself varies. OEM parts are generally more expensive than aftermarket options, though quality can vary with aftermarket parts. 
• Other parts: It is often recommended to replace related components like tensioners and gaskets at the same time to avoid future repairs and potentially reduce overall labor costs. 
• Location: Labor rates can differ based on your geographic location. A shop in a metropolitan area may have higher labor rates than one in a rural area. 

What to expect

• Professional repair: Expect a total cost between $1,500 and $4,000.
• DIY repair: For individuals with the necessary skills, the cost for parts alone is estimated between $500 and $900. 

Important considerations

• If you suspect a timing chain issue, get it inspected immediately, as a failing chain can cause severe engine damage. 
• Get multiple quotes from different shops, preferably including independent mechanics who specialize in Japanese vehicles, to ensure you're getting a fair price. 
• Be aware that a high quote, such as $6,500, may be a "we don't want to do this job" price, and you should definitely seek other estimates. 

What year to avoid Lexus RX 350 used?

You should generally avoid the 2007, 2008, 2010, 2016, and 2017 model years of the Lexus RX 350 due to common issues like oil leaks, engine problems, and transmission issues. The 2007 and 2008 models are flagged for oil leaks and cracking dashboards, while the 2010 has known engine and rattling door problems. The 2016 and 2017 models are associated with transmission and oil leak issues.
 
This video discusses Lexus RX models to avoid and their issues: 1mThe Miles DrivenYouTube · Dec 18, 2024
Specific years to avoid

• 2007: Notorious for cracking dashboards and oil leaks. 
• 2008: Did not see significant reliability improvements over 2007 and has reported issues with steering and oil leaks. 
• 2010: Faced common engine and body integrity issues, including rattling doors. 
• 2016: The first year of the fourth generation, it had issues with transmission problems and oil leaks. 
• 2017: Another year to approach with caution due to transmission and oil leak problems. 

Other considerations

• VVT-i oil line issue: A faulty VVT-i oil line can cause engine failure and is a problem seen in many models from 2007-2015, according to CarParts.com. 
• First-year models: As a general rule, it's often best to avoid the first year of a new generation, which can have bugs that are worked out in later years. 
• Reliable years: Some recommended, more reliable years include 2011–2015, 2018, and 2019.