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Audi S5 High Intensity Discharge (HID) Lighting Ballasts

Audi S5 High intensity discharge (hid) lighting ballasts

Starting at $130.95, AutoBuffy stocks 5 HID lighting ballasts from Standard Ignition, Dorman, and URO for the Audi S5. The ballast is the control unit that converts your vehicle's 12-volt DC power into the high-voltage arc needed to ignite and sustain an HID bulb. When it fails, headlights flicker, strobe, or go dark entirely — a direct road-safety issue.

Signs your Audi S5 HID ballast is failing

  • Headlight takes several seconds to reach full brightness or never fully brightens after a cold start
  • One or both HID headlights flicker repeatedly at low speeds or during engine vibration
  • Headlight strobes rapidly then shuts off, often resetting when you cycle the ignition
  • One headlight goes completely dark while the bulb and fuse test as good
  • Headlight output is noticeably dimmer or produces an off-color (pink, green, or yellow tint) compared to the working side
  • DTC or warning light for a headlight fault appears on the dashboard even though the bulb is not burned out

Which HID ballast should you buy for your Audi S5?

The most important decision is whether to match OEM specifications or upgrade to an aftermarket unit rated for your bulb wattage and igniter type. Some Audi S5 applications combine the ballast and igniter in a single assembly, while others use separate components — confirm which configuration your trim uses before ordering. Fit, wattage rating (typically 35W or 55W), and connector type must all match.

OEM-Equivalent Replacement Ballast
Best for
Drivers who want plug-and-play reliability with no adjustments
What you get
Direct connector match, factory wattage rating, straightforward swap with no wiring modification
Aftermarket Standard (35W)
Best for
Budget-conscious owners replacing a failed OEM unit
What you get
Lower cost, adequate output for factory HID bulbs, may require pigtail adapter depending on connector style
High-Output Aftermarket (55W)
Best for
Owners who want brighter output or are pairing with upgraded HID bulbs
What you get
Increased luminous output, shorter warm-up time, generates more heat — verify housing clearance and bulb compatibility
Ballast + Igniter Assembly (Combined Unit)
Best for
Vehicles where the OEM design integrates both components, or when the igniter has also failed
What you get
Single-unit replacement eliminates the need to diagnose which sub-component failed, often more cost-effective than separate parts

High intensity discharge (hid) lighting ballasts brands we stock for your Audi S5

Standard Ignition
2 options · from $340.95
Dorman
2 options · from $331.95
URO
1 option · from $130.95

Replacing the HID lighting ballast on a Audi S5

Moderate⏱ 45 minutes – 1.5 hoursTrim removal pry tools or panel clipsScrewdrivers (flathead and Phillips)Socket set with extensionsNeedle-nose pliers (for connector clips)Dielectric grease

Access to the ballast on most vehicles requires removing the headlight assembly or working through the wheel well liner; consult your service manual for the exact access point on the Audi S5. Disconnect the battery before handling any HID components — the system operates at voltages that can cause serious injury. Once the old ballast is out, transfer connectors to the new unit, apply dielectric grease to the electrical connectors, and retest before reassembling any trim or panels.

Frequently asked questions

How much does it cost to replace HID lighting ballasts on a Audi S5?
Parts start at $130.95 on AutoBuffy. A single ballast typically falls in the budget-to-mid range for the part alone; if your vehicle uses a combined ballast-igniter assembly, expect a higher parts cost. Add one to two hours of shop labor if you are not doing the job yourself.
How do I know if it's the HID ballast or the bulb that failed on my Audi S5?
Swap the suspect headlight's bulb with the known-good bulb from the other side. If the problem moves with the bulb, the bulb is at fault. If the dark or flickering side stays dark with a known-good bulb installed, the ballast or igniter on that side is the likely cause and should be tested or replaced.
Can I replace just one HID ballast, or should I replace both on my Audi S5?
Replacing only the failed side is acceptable and common. However, if both ballasts are original and have high mileage, replacing in pairs makes sense because the second unit is likely near the end of its service life too. Mismatched ballast brands or wattages can also produce noticeably uneven color output between headlights.
Do I need to replace the igniter when I replace the HID ballast on my Audi S5?
Not always, but it is worth inspecting. The igniter is the component that produces the initial high-voltage spike to strike the arc. On many platforms the igniter is a separate part; on others it is integrated into the ballast housing. If the ballast failed due to moisture intrusion or heat, the igniter may be damaged as well.
Will an aftermarket HID ballast work with my Audi S5's factory bulbs and headlight housing?
Generally yes, provided the wattage rating matches (most OEM systems are 35W), the output voltage is compatible with your bulb type (D1S, D2S, D2R, D3S, D4S, etc.), and the connector matches or an adapter is used. Mismatched wattage can shorten bulb life or trigger warning lights on vehicles with adaptive front-lighting systems.
How long does an HID ballast last on a Audi S5?
HID ballasts typically last many years under normal use, but service life varies with heat exposure, moisture intrusion, and how frequently the system is cycled on and off. Units in poorly sealed housings or in climates with large temperature swings tend to fail earlier. Frequent short trips that cycle the ballast repeatedly can also accelerate wear.

Shop high intensity discharge (hid) lighting ballasts by year for the Audi S5

201620152014201320122011201020092008

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