Volvo S90 Turn Signal Bulb Size

The Volvo S90 front turn signal uses 12174NA, PY24WNA, or 1157NA bulb sizes, while the rear turn signal requires H21W or 1156 replacement bulbs according to the chart. Data spans from 1997 to 2024, covering all production years for this model's turn signal bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2021	12174NA
2020	12174NA (With Halogen Capsule Headlamps)
2017-2019	PY24WNA (With Halogen Capsule Headlamps)
1997-1998	1157NA

Rear Turn Signal

Years	Bulb Size
2023-2024	H21W
2021	H21W
1997-1998	1156

Bulb Specifications

Description	Bulb Size
OEM part number. Natural amber glass variant. 12V.	12174NA
ANSI standard (US & Canada). Amber variant of ECE PY24W with PGU20-4 base. 12V, 24W.	PY24WNA
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 21W/5W.	1157NA
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The PY24WNA is an ANSI-standard bulb rated at 12V and 24W, featuring a PGU20-4 base. It serves as the amber variant of the ECE PY24W and was specified for the front turn signal of the Volvo S90 from 2017-2019, restricted to vehicles equipped with halogen capsule headlamps.
The 12174NA is an OEM-designated bulb with natural amber glass, rated at 12V. It replaced the PY24WNA in the front turn signal position for the 2020 S90 (with halogen capsule headlamps) and carried forward to the 2021 model year without a headlamp condition noted.
The H21W follows ECE standards, making it common in European and worldwide markets. It is a single-filament signalling bulb with a BAY9s base, rated at 12V and 21W, and is specified for the rear turn signal across the 2021, 2023, and 2024 model years.
The 1157NA is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments drawing 21W and 5W respectively. Its dual-filament design distinguishes it from single-filament alternatives and was used in the front turn signal position on the 1997-1998 S90.
The 1156 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. It was specified for the rear turn signal on the 1997-1998 S90, sharing the same wattage as the H21W but differing in base type and regulatory standard.
The BAY15d base of the 1157NA and the BA15s base of the 1156 are both bayonet-style fittings, but they are not interchangeable. The BAY15d has offset pins to accommodate the dual-filament configuration, while the BA15s uses a single-contact design suited to single-filament operation.
The front and rear turn signal positions on the 1997-1998 S90 used different bulb types, with the 1157NA at the front and the 1156 at the rear. These two bulbs share the same 12V rating but differ in filament count and base type, making substitution between positions incorrect.
The 2020 front turn signal specification carries a halogen capsule headlamp condition, while the 2021 entry for the same position lists the 12174NA without that condition noted, indicating a distinction in fitment context between those two model years.