FAQ
TL;DR: For the Audi A3 8L (1998), 2 catalog numbers were identified for the headlight switch and, as one expert put it, "both will match." [Elektroda, masay1, post #16756415]
Why it matters: This FAQ helps A3 8L owners replace a failed light switch confidently—especially when only rear fogs are present and no ID sticker exists.
Quick Facts
- Confirmed catalog options: 8L1941531H and 8L1941531HB98; later supersession favored the latter. [Elektroda, masay1, post #16756415]
- A switch stamped 8L2941531H was installed and reported working without issues. [Elektroda, Pawel.k20, post #16766404]
- Using a switch with front + rear fog positions: rear fogs engage on the second pull detent. [Elektroda, grala1, post #16756485]
- Plug/connector is identical regardless of fog options; base lighting operates even if some pins are unused. [Elektroda, grala1, post #16758242]
- UK (“Englishman”) vs EU switch variants exist; order for the “continent” if your car is LHD/EU. [Elektroda, masay1, post #16756415]
Which headlight switch part numbers fit a 1998 Audi A3 8L with only rear fog lights?
Catalog numbers 8L1941531H and 8L1941531HB98 were identified as matching for the A3 8L. The expert who provided them wrote, “both will match.” Choose the newer supersession when possible. [Elektroda, masay1, post #16756415]
Will a switch that has front fog light positions work if my car only has rear fogs?
Yes. Functionally, you’ll pull once for front fogs and twice for rear fogs; with no front fogs fitted, only the second detent activates the rear fogs. “What is not in the car will not light up.” [Elektroda, grala1, post #16756485]
Is there a real-world confirmation that 8L2941531H works?
Yes. A user installed a new switch labeled 8L2941531H and reported that everything worked as it should after fitting. That post closes the loop for owners seeking a drop-in solution. [Elektroda, Pawel.k20, post #16766404]
How do I replace the A3 8L headlight switch without an ID label? (3 steps)
- Compare the rear connector and detent icons to your old switch using seller photos. 2. Order a compatible A3 8L/Golf 4–type switch with matching markings. 3. Install; base lighting functions with the identical plug. “Google the photos from the back.” [Elektroda, grala1, post #16758242]
What’s the difference between a catalog number and a part number on these switches?
One poster clarified that sellers often list part numbers, while shops search by catalog numbers; they aren’t always identical. Buy by function and markings if numbers differ but the mechanism and connector match. [Elektroda, masay1, post #16758232]
Will 8L1941531E fit my A3 8L electrically?
The guidance given was “99% yes,” provided the unit is mechanically and electrically equivalent and carries the same functional icons. Quote: “If it has the same functional markings…it will be OK.” Verify the rear connector before purchase. [Elektroda, masay1, post #16758232]
Can I use a Golf 4 headlight switch in an A3 8L?
Yes. The Golf 4 switch fits electrically in the A3 8L; the plug is identical. Note that the illumination dimmer style can differ, but the base lighting will still operate. [Elektroda, grala1, post #16758242]
EU vs UK switch: does it matter for my 8L?
Yes. An expert noted the photographed unit looked like an “Englishman,” while the provided numbers were for the “continent.” Order the EU/LHD variant to match icon orientation and compliance. [Elektroda, masay1, post #16756415]
Any brand sourcing tips if I can’t find an Audi-boxed part?
One member buys compatible switches from Škoda parts counters and reports consistent fit. This can help when Audi or VW stock is scarce locally. [Elektroda, Aleksander_01, post #16759399]
Does the connector change if my car lacks front fogs?
No. The A3 8L uses the same plug regardless of fog equipment; unused positions simply remain unpinned. Base lighting functions once you connect the switch. [Elektroda, grala1, post #16758242]
What statistic from this thread should reassure me before ordering?
Two compatible catalog numbers were provided by an expert, and at least one successful installation was reported later. This indicates a high likelihood of success when matching connector and icons. [Elektroda, masay1, post #16756415]
Will an A3 8L switch fit electrically in an Audi A2 (8Z)?
This thread does not confirm A2 compatibility. Follow the advice to compare rear-connector photos and pinouts before trying, since platform wiring may differ. Use the back-photo check to avoid damage. [Elektroda, grala1, post #16758242]
Edge case: What can go wrong if I buy the wrong regional variant?
Icon orientation or compliance may not match, and you could receive a RHD/UK unit. The expert flagged this risk; order for the “continent” if your car is EU/LHD. [Elektroda, masay1, post #16756415]
Any sign that aftermarket listings without catalog numbers are OK?
Yes, if the unit matches by mechanism, connector, and icons. The advisor stressed that auctions list part numbers, not catalog numbers; buy by function and markings. [Elektroda, masay1, post #16758232]
