What is the belt number for a Lexus RX 350?
In short, there isn’t a universal timing belt number for the RX 350 because these models use a timing chain rather than a timing belt. If you’re thinking about the belt you replace during maintenance, that’s the serpentine (accessory) belt, and its part number varies by year and engine. Here’s how to determine the exact belt you need and what to expect from maintenance.
Understanding the RX 350 belt system
Across generations, the RX 350 has used a timing chain to drive the camshafts, not a timing belt. The belt you may need to replace is the serpentine belt that drives accessories such as the alternator, power steering pump, and air conditioning compressor.
Timing chain vs timing belt
Most RX 350 engines, including the common 2GR-FE 3.5-liter V6, rely on a timing chain. This is designed to last longer than a belt and generally does not require routine replacement as part of normal maintenance unless a failure occurs. The serpentine belt, however, wears out and can break or slip, so it is replaced at intervals based on year and driving conditions.
Finding the correct serpentine belt part number
Because the RX 350 has multiple model years and engine variants, the correct serpentine belt part number is not universal. You should use the official parts database or a dealership reference to confirm the exact belt for your vehicle.
How to determine the right belt number:
- Gather your vehicle information: year, trim, engine code (for example, 2GR-FE), and VIN if available.
- Check the OEM parts catalog (Toyota/Lexus Parts) for a serpentine belt by entering year and engine code.
- Ask a Lexus dealer or parts counter with your VIN for the precise belt part number and compatible accessories.
- Consult service manuals or reputable repair guides that show belt routing and part numbers for your specific model.
With this approach, you’ll identify the exact belt part number rather than relying on a generic “belt number.” Replacement intervals for the serpentine belt are typically 60,000–100,000 miles depending on driving conditions, with regular inspections at service intervals.
Maintenance intervals and wear signs
Common signs that the serpentine belt needs replacement include cracking, fraying, glazing, or audible squealing from the belt area. If the belt shows wear or you notice issues with power steering, alternator charging, or AC performance, have it inspected by a qualified technician.
Conclusion and summary
In summary, the RX 350 does not use a timing belt; it uses a timing chain. The belt number you may be thinking of refers to the serpentine belt, which varies by year and engine. Always verify the exact belt part number through Toyota/Lexus’ official parts resources or a dealership using your vehicle’s year, engine, and VIN. Regular inspection of the serpentine belt helps prevent unexpected failures and ensures auxiliary components operate reliably.
Additional resources
For more details, consult the Lexus RX 350 owner’s manual, official service manuals, or the dealer’s parts catalog, which provide the exact belt numbers and routing diagrams for your vehicle’s specific configuration.
Summary: The RX 350 does not have a universal timing belt number because it uses a timing chain. The relevant belt is the serpentine belt, whose part number is year/engine dependent. Use official parts catalogs or a dealer to determine the exact belt part number, and monitor belt condition as part of routine maintenance.
How to check serpentine belt number?
And it is measured at the cord. Line. If you talk to a catalog specialist at a belt. Company they would tell you the effective length of the belt is part of the part.
What is the size of a Lexus RX 350?
The Lexus RX 350's exterior dimensions are approximately 192.5 inches long, 75.6 inches wide, and 67.3 inches high, with a wheelbase of 112.2 inches for the most recent model years. These dimensions can vary slightly based on the model year and trim, but these figures represent the 2025 model year. Interior dimensions include 41.1 inches of front legroom and 37.4 inches of rear legroom.
Exterior dimensions
- Length: 192.5 inches
- Width: 75.6 inches (with mirrors folded)
- Height: 67.3 inches
- Wheelbase: 112.2 inches
Interior dimensions
- Front legroom: 41.1 inches
- Rear legroom: 37.4 inches
- Front headroom: 38.1 inches (with moonroof) or 39.5 inches (without moonroof)
- Rear headroom: 38.5 inches (with moonroof) or 38.6 inches (without moonroof)
- Front shoulder room: 58.1 inches
- Rear shoulder room: 56.5 inches
- Front hip room: 56.7 inches
- Rear hip room: 55.9 inches
What year to stay away from Lexus RX 350?
Years to avoid for the Lexus RX 350 include 2007, 2008, 2010, 2016, and 2017 due to common problems like oil leaks, engine issues, brake failures, and faulty sensors. The 2010-2012 models are particularly prone to a ruptured oil cooler line that can cause engine failure, while the 2007-2009 models had issues with cracking dashboards and a faulty brake master cylinder. The 2016 and 2017 models saw recalls related to airbags and issues with rain sensors, notes CoPilot.
You can watch this video to learn about the history of the Lexus RX 350 and common problems in different generations: 1mThe Miles DrivenYouTube · Dec 22, 2024
Years to avoid and why
- 2007–2009: These models are known for cracking dashboards and a faulty brake master cylinder that can lead to brake failure.
- 2010–2012: A common and severe problem with these years is the oil cooler line, which can rupture and lead to engine failure.
- 2016–2017: The 2016 model year had airbag recalls and was the first year of a new generation, which can lead to early bugs. The 2017 model had issues with the rain sensor and wipers, in addition to having its own airbag recalls.
What to look for instead
- 2011–2015: These models generally have fewer issues, with the 2013–2015 models in particular being noted as more reliable.
- 2018–2022: Models from these years are considered more reliable, especially those with the redesigned exterior.
- 2020–2022: These are considered among the most reliable years, with the 2020 model year being a good choice.
This video discusses the best Lexus RX 350 years to buy: 59sThe Miles DrivenYouTube · Dec 18, 2024
What is the part number for the serpentine belt on a 2008 Lexus RX 350?
90916A2010
2008 Lexus RX 350 Serpentine Belt - 90916A2010 - Genuine Lexus Part.
