Mercedes-Benz Metris Turn Signal Bulb Size

Additional Notes

• The rear turn signal position on the Mercedes-Benz Metris uses the P21W bulb across all listed model years from 2016-2023, making it the most consistent bulb specification across the entire turn signal system.
• P21W is an ECE-standard single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base. The BA15s base features a single contact pin offset to one side, which allows the bulb to seat in only one rotational orientation.
• PY21W shares the same 12V, 21W rating as P21W but is distinguished by its amber-tinted glass and a BAU15s bayonet base. The BAU15s base has its contact pin offset at a different angle than the BA15s, making PY21W and P21W physically non-interchangeable despite their similar wattage and voltage ratings.
• The 12496 is a Philips/Osram part number designating a 12V halogen bulb for specialty applications. It appears in the front inner turn signal position for 2016, 2019, and 2020 model years, and in the front turn signal position for the 2018 model year.
• The front turn signal position on the 2019 Metris carries a notation indicating the bulb is located on the headlamp assembly, while the 2016 model year entry for the same position is noted as the main front turn signal, suggesting positional or assembly distinctions within that model year.
• The front inner turn signal position shows alternating bulb types across its listed years, with PY21W specified for 2017-2018 and 12496 specified for 2016, 2019, and 2020. This variation indicates the position did not use a single standardized bulb type throughout its production run.
• PY21W appears across both the front inner and front turn signal positions on the Metris, though the two positions use different base types in other years, meaning PY21W fitment in one position does not imply interchangeability with the other position.