2017-2023 Audi R8 Coupe Engine Partition Glass: Identifying the Correct Version
This guide clarifies the crucial differences between the R8's interior partition glass options and highlights what to inspect before buying a used one.
- This is the INTERIOR partition glass for COUPE models only, not the exterior rear window or for the Spyder convertible.
- Two main part numbers exist (4S8845151 and 4S8845501) with vastly different prices; you must match your car's original part number.
- Failures are not common, but watch for cracks or rattling noises from loose mounts.
- Replacement is a complex job requiring extensive interior disassembly and is not recommended for DIY.
Crucial Compatibility Warning: Coupe Only
Important: This is the vertical glass partition located inside the vehicle, between the seats and the engine. It is NOT the exterior rear window (backlight). This part fits 2017-2023 Audi R8 Coupe models ONLY. It will not fit the R8 Spyder (convertible), which uses a completely different rear window and wind deflector assembly.
Symptoms of a Failing Partition Glass
Unlike exterior windows, this interior glass is protected from road debris and weather. Failures are uncommon, but can occur. Symptoms are usually straightforward:
- Cracks or Fractures: Physical damage can occur from stress, body flex during extreme driving, or from an object striking the glass from inside the cabin. A crack will compromise the sound and heat insulation.
- Rattling Noises: A rattling or buzzing sound from behind the seats, especially over bumps or at certain engine RPMs, can indicate that the glass panel's seals or mounting hardware have become loose. While forum discussions mention window rattles in general, this specific part is not a widely reported source of noise.
Known Issues, Recalls, and Technical Service Bulletins (TSBs)
As of this writing, there are no specific recalls or Technical Service Bulletins (TSBs) from Audi or the National Highway Traffic Safety Administration (NHTSA) related to the rear partition glass for the 2017-2023 Audi R8.
The 2017 Audi R8 has been subject to other recalls, including for a Takata driver's airbag inflator and a potential transmission fluid leak, but neither of these involves the vehicle's glass components.
Variant Differences: 4S8845151 vs. 4S8845501
One of the most critical things for a buyer to understand is that multiple versions of this glass exist, and they are not interchangeable. The primary part numbers you will encounter are:
- 4S8845151 (and its variant 4S8845151NVB)
- 4S8845501 (and its variant 4S8845501NVB)
While the exact differences are not officially documented in publicly available information, they are likely tied to specific vehicle options, such as the extended leather package or other interior trim variations that affect the glass mounting. The price difference between these parts on the used market is significant, with the 4S8845501 version often being several times more expensive than the 4S8845151.
Warning: You MUST verify the part number on your vehicle's original glass before purchasing a replacement. Installing the wrong version may lead to fitment issues, rattles, or incompatibility with surrounding interior trim panels.
Buying a Used Partition Glass: What to Check
A used OEM partition glass is a great way to save money, as aftermarket versions are not available for this specialty part. Given the high cost of a new replacement, a carefully inspected used part offers significant value. Here’s what to look for:
- Confirm the Part Number: This is the most important step. Match the part number exactly to your original glass. Do not buy a different number assuming it will fit.
- Inspect for Cracks: Carefully examine the entire surface, paying close attention to the edges and mounting points. Hairline cracks can be difficult to see but will worsen over time due to vibration and temperature changes.
- Check for Scratches: Look for deep scratches or scuffs on either side of the glass. While minor blemishes may be acceptable, significant scratches will be visible from the cabin.
- Examine the Edges: Check for any chips or damage along the perimeter of the glass. This is where cracks often start.
- Seal and Gasket Integrity: If the glass comes with any attached seals or gaskets, ensure they are pliable, intact, and not brittle or torn.
Replacement Difficulty
Installation Difficulty: 4 out of 5
Replacing the rear partition glass is a complex and time-consuming job that is not recommended for most DIY mechanics. The process requires the careful removal of numerous interior trim panels behind the seats, which can be delicate and easily damaged. While a specific guide for the coupe is not readily available, procedures for accessing nearby components on the R8 involve extensive disassembly. This job is best left to a professional auto glass installer or a technician experienced with Audi R8 interiors.
Pro Tip: Due to the complexity of the installation, consider purchasing the part yourself and having a qualified independent shop or specialty glass installer perform the labor to save on dealership costs.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM | $800 - $2,000+ (Varies significantly by part number) |
| Used OEM | $150 - $1,700 (Varies significantly by part number) |
| New Aftermarket | Not Available |
| Shop Labor | $400 - $700+ (Estimate based on complexity) |
Frequently Asked Questions (FAQ)
Is this the same as the exterior rear window?
No. This is the interior vertical glass panel that sits between the seats and the engine compartment on Coupe models. It is not the main rear window exposed to the outside.
Will this glass fit my 2018 Audi R8 Spyder?
No. This part is exclusively for the Audi R8 Coupe. The Spyder (convertible) model has a completely different rear glass and power window mechanism.
Why are there two different part numbers with such different prices?
The exact reason is not officially published, but the different part numbers (4S8845151 and 4S8845501) likely correspond to different interior trim packages or vehicle options from the factory. Because the fit and finish are precise, you must match the part number from your original glass to ensure compatibility.
Can I install this partition glass myself?
It is not recommended for beginners. The installation requires extensive removal of interior trim panels, which can be complex and risks damaging expensive components. This job is best suited for a professional with experience on high-end vehicles.
Technical Specifications
OEM Part Numbers: 4S8845151 4S8845151NVB 4S8845501 4S8845501NVB
Vertical glass partition for cabin/engine bay separation.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi R8:
- Crucial Compatibility Warning: Coupe Only
- Symptoms of a Failing Partition Glass
- Known Issues, Recalls, and Technical Service Bulletins (TSBs)
- Variant Differences: 4S8845151 vs. 4S8845501
- Buying a Used Partition Glass: What to Check
- Replacement Difficulty
- Cost Comparison
- Frequently Asked Questions (FAQ)
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