Nissan Maxima Stepwell Bulb Size

Additional Notes

• The Nissan Maxima stepwell bulb specifications cover model years 1995 through 2023 and include four distinct bulb sizes: 194, 168, 158, and 74.
• All four bulb sizes listed are ANSI-standardized miniature wedge types operating at 12 volts, which is consistent with standard automotive low-voltage lighting systems.
• The 194, 168, and 158 bulbs share the T10 wedge base form factor, meaning they are physically interchangeable in terms of socket fit, though their wattage ratings differ at 3.78W, 4.9W, and 3W respectively.
• Despite the shared T10 base among the 194, 168, and 158 bulbs, substituting one for another without confirming the correct specification for a given model year may result in a mismatch in light output, as wattage directly affects brightness.
• The 74 bulb uses a smaller T5 wedge base at 1.4W, making it physically incompatible with the T10 sockets used in other Maxima model years.
• The Nissan Maxima (1995-2008) stepwell position used the size 74 bulb, which at 1.4W represents the lowest wattage among all bulb sizes specified across the model's history.
• A bulb size change from 158 to 168 occurred between the 2016 and 2019 model years, and a further change from 168 to 194 occurred between the 2018 and 2019 model years, indicating that the T10 socket was retained while the wattage specification was revised.
• The 194 bulb applies to the 2019-2023 Maxima stepwell position, and at 3.78W it falls between the 3W rating of the 158 and the 4.9W rating of the 168 on the wattage scale.