Buy BMW 335i Turn Signal Light Bulbs

The BMW 335i turn signal light bulb-also called an indicator bulb, blinker bulb, or signal lamp bulb-tells other drivers when you plan to turn or change lanes. It flashes amber at the front. In the U.S., the rear can be amber or red depending on the car and market rules. See U.S. lighting rules in FMVSS 108 and international rules in UNECE Regulation 148. (eCFR, UNECE)

"335i" covers two generations: E90/E92/E93 (sedan/coupe/convertible, roughly 2007-2013) and F30 (sedan, roughly 2012-2015). Bulb styles can differ by trim and package (some cars use LED modules instead of a replaceable bulb). Always confirm using your specific owner's manual or VIN. You can look up manuals at the official BMW Digital Owner's Manual portal. Chassis timelines: E90 3 Series and F30 3 Series. (BMW USA, Wikipedia)

Most 335i models that use a replaceable turn bulb use a 21-watt single-filament "P" family lamp:

• PY21W (also called 7507) - amber bulb with BAU15s base (pins offset 150°).
• P21W (also called 7506/1156) - clear bulb with BA15s base (pins opposite 180°), used behind an amber lens.
  PY21W/7507 tech sheets: OSRAM PY21W datasheet • Philips 12496 (PY21W) specs. Base differences (BAU15s 150° vs BA15s 180°) are explained here: BAU15s vs BA15s overview. (OSRAM, p4c.philips.com, BulbAmerica)

• Voltage: 12 V
• Wattage: 21 W
• Base: BAU15s for PY21W (amber) or BA15s for P21W (clear)
• Output: ~280 lumens (typical for PY21W)
  See OSRAM spec sheets: PY21W "Diadem Chrome" example (280 lm). Philips PY21W specs: 12496NACP. (OSRAM, Philips Documents)

Front turn signals must be amber. Rear signals can be amber or red in the U.S., depending on the vehicle. Details live in FMVSS 108. Many markets outside the U.S. follow UNECE rules for direction indicators; see UNECE Regulation 148. (eCFR, UNECE)

Use any (or all) of these:

• Owner's manual: look for the bulb chart (BMW's manual portal).
• Old bulb: the glass/metal base is stamped PY21W or P21W; "BAU15s" means offset pins (amber bulb), "BA15s" means straight pins (clear bulb). BAU15s vs BA15s info.
• Chassis notes: many E90/E92/E93 and F30 trims with non-LED signals use PY21W/7507. Verify to be sure. (BMW USA, BulbAmerica)

LED "retrofit" bulbs can draw less power and look crisp, but legality varies. For example, OSRAM notes some PY21W LED retrofits aren't approved for exterior road use in many regions. Always check local law and product notes before installing LEDs in turn signals. See OSRAM's notice in its LEDriving SL PY21W datasheet. U.S. performance requirements are in FMVSS 108. (OSRAM, eCFR)

• Park safely, switch the lights off, and let lamps cool. (BMW cautions to follow the bulb maker's instructions.) See a 3 Series manual excerpt here.
• Front (E90/E92/E93): access is usually through the wheel-well service panel or liner; twist the bulb holder to release. DIY videos can help visualize the access path (example: E9x front indicator video).
• Front (F30): access is from behind the headlamp; wheel-well access helps on some cars (example: F30/F31 front indicator video).
• Rear: open trunk, remove the trim/cover, twist out the bulb holder, swap bulb, and lock it back in.
• After install, test left/right and hazards.
  Manual safety notes and E9x examples: BMW manual excerpt • E9x DIY video • F30 DIY video. (CSPO, YouTube)

Some 335i cars have mirror-mounted turn repeaters that are sealed LED modules (not simple bulbs). If one fails, you replace the small module in the mirror cap. See this illustrated guide for 2011-2018 3 Series: iFixit mirror indicator replacement.

• Fast blinking (hyperflash) or a dash warning means a bulb or circuit issue. BMW manuals note that unusually rapid flashing often points to a failed indicator. Example manual excerpt.

Hate the "egg-yolk" look in a clear lens? Consider an amber-when-lit, chrome-when-off PY21W styling bulb (same 21 W rating). Example data sheet: OSRAM Diadem Chrome PY21W.

• BMW Digital Owner's Manual (VIN lookup): bmwusa.com/owners-manuals.
• U.S. lighting standard: FMVSS 108.
• International lighting (ECE): UNECE Regulation 148.
• PY21W spec examples: OSRAM datasheet • Philips 12496 specs. (OSRAM, p4c.philips.com)
• LED retrofit caution: OSRAM LEDriving SL PY21W note.

For most BMW 335i models that use a serviceable bulb, you'll be looking for a 21-watt single-filament indicator bulb-commonly PY21W (7507) with a BAU15s base for clear-lens fronts and many rears, or P21W with BA15s behind amber lenses. Confirm by VIN/manual, match the base and wattage, and follow basic safety steps. If you go LED, check the legal notes first and use parts designed for your vehicle and market. Manual portal • FMVSS 108 • UNECE R148. (BMW USA, eCFR, UNECE)