OVERVIEW
Genuine VW/Audi N-908-733-01 is an individual tire valve stem core, also called a valve insert. It provides the serviceable sealing element inside the specifically assigned original metal TPMS valve assembly.
Technical details and contents
- Factory number: N-908-733-01 / N90873301.
- Component: individual spring-loaded valve core insert.
- Quantity supplied: one core.
- The archive photograph shows the insert body, central pin and sealing features.
- The valve stem, cap, sensor, wheel and tire are separate.
Function in the valve assembly
The core opens when its center pin is depressed for inflation or pressure measurement and closes to retain air when released. It fits inside the assigned valve stem. It is separate from the electronic TPMS sensor and does not transmit a radio signal.
A vehicle's model and year alone do not guarantee fitment when its wheels or valve stems have been changed. Confirm the installed valve assembly and exact factory core assignment before ordering. Do not select a substitute merely because it resembles a common valve insert.
Common reasons to replace
- A leak has been positively traced to the valve core.
- The center pin or sealing element is damaged.
- Corrosion or contamination prevents correct sealing.
- The core was lost or damaged during valve service.
- Correct original service hardware is required for the assigned metal valve.
Air loss can also come from a damaged stem, stem seal, wheel bead or tire. Check the complete assembly rather than assuming the core is responsible. A replacement core does not repair a faulty electronic sensor or resolve every TPMS warning.
Vehicle fitment
The following applications use the specifically assigned original metal valve assembly. Match the installed stem and hardware; replacement wheels and aftermarket sensor kits may use different service parts.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi R8 | 2008, 2011 | 4.2L gasoline V8 | Type 42 Coupe; original metal TPMS valve; 6-speed manual / R tronic; quattro | Valve core for the original 420601361A-type metal TPMS valve assembly assigned in the catalog. Verify the installed stem; aftermarket wheels, replacement stems and indirect-TPMS configurations require separate confirmation. |
| Audi R8 | 2011 | 5.2L gasoline V10 | Type 42 Coupe / Spyder; original metal TPMS valve; 6-speed manual / R tronic; quattro | Valve core for the original 420601361A-type metal TPMS valve assembly assigned in the catalog. Verify the installed stem; aftermarket wheels, replacement stems and indirect-TPMS configurations require separate confirmation. |
| Audi RS6 Avant | 2021 | 4.0L twin-turbocharged gasoline V8 with mild hybrid system | C8 wagon; original metal direct-TPMS valve; 8-speed Tiptronic; quattro | Valve core for the original 420601361A-type metal TPMS valve assembly assigned in the catalog. Verify the installed stem; aftermarket wheels, replacement stems and indirect-TPMS configurations require separate confirmation. |
Installation guidance
Follow the factory tire and TPMS valve service procedure. Release pressure before removing the core, use the appropriate core tool and protect the valve bore from contamination. Inspect the stem and sealing seat before fitting new service hardware.
Use the specified tightening procedure for the exact valve assembly. Do not overtighten the insert or use an incompatible core in a metal stem. Inflate to the vehicle's specified cold pressure, check the valve and stem for leaks and complete any required TPMS service checks.
Ordering information
This listing supplies one genuine valve core. It does not include a valve cap, complete stem, TPMS sensor, pressurized container, wheel or tire. Confirm the number of cores needed for the actual repair.