2020 Audi TT Bulb Size

Decision: choose the correct bulb sizes for a 2020 Audi TT to restore lighting performance while avoiding returns or fit issues. Constraints include variant trim differences, aftermarket labeling inconsistencies, and limited space in the headlamp assembly, which form the evidence that a simple lookup can still require interpretation. Options range from OEM replacements to high-performance LEDs and budget halogen copies, each with trade-offs in lifespan, beam pattern, and thermal limits. Comparison of these options against the car’s specifications and user reports highlights limitations of some LED kits in enclosed housings, a hypothesis supported by heat-related failure reports. Recommendation: use the OEM-specified sizes for the 2020 Audi TT unless you can verify housing compatibility and thermal management for upgrades. Affiliate disclaimer: some links on this page are affiliate links, which means I may earn a commission at no extra cost to you; this supports maintenance of the chart while preserving impartial comparison and noting potential conflicts of interest. Risks: misfit bulbs can impair visibility and trigger errors, an outcome the evidence suggests is avoidable with careful selection.