The Renault R18i uses 194 bulb size for both front and rear side marker positions. The replacement chart covers 1981 to 1986 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Renault R18i uses the 194 bulb for both its front and rear side markers across the 1981-1986 model years.
The 194 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to a tubular bulb roughly 10 millimeters wide with a wedge base that seats directly into a socket without a separate metal base or pins.
The 194 bulb operates at 12 volts and draws 3.78 watts, placing it among the lower-wattage bulbs used in automotive marker lighting applications.
The 194 designation follows ANSI standards recognized in both the United States and Canada, meaning the specification conforms to a standardized performance and dimensional classification rather than a manufacturer-specific part number.
Because the Renault R18i uses the same 194 bulb in both the front and rear side marker positions, a single bulb type serves all four side marker sockets on the vehicle.
The T10 wedge base format is widely used across many vehicle makes and model years, which means the 194 bulb is broadly available as a replacement in aftermarket and OEM supply channels.
The wedge base design of the 194 bulb means fitment depends on socket compatibility rather than a bayonet or screw-type locking mechanism, and substituting a bulb with a different base type would not physically seat correctly even if the voltage rating matched.
While other T10 wedge bulbs exist with similar physical profiles, wattage differences from the specified 3.78W rating can affect socket heat tolerance and circuit load, making exact specification matching relevant for long-term fitment.