On the Volkswagen Scirocco (2010), fault code 02394 means the Body Control Module has detected an open circuit in the left front parking (side marker) light -- the lamp filament has burned out or the socket has lost electrical contact.
What 02394 means
VAG fault code 02394 is stored by the Body Control Module (ZAS or Central Convenience Electronics) when it monitors the current draw of the left front parking light circuit and finds it below the expected range for a functioning incandescent bulb. Volkswagen's body electronics modules use current-sensing on lamp circuits to detect bulb failures without requiring a separate sensor -- a working 5 W parking lamp bulb draws a predictable current, and a value near zero indicates a burned-out filament or broken circuit. The left front parking light sits in the front light cluster on the Scirocco 1K8 platform (based on the Mk5 Golf). It is a standard W5W bayonet-fit bulb in a separate socket within the headlight housing. Code 02394 is only stored for the left side; the equivalent right-side code is different.
Symptoms
- Left front parking/side marker light not illuminated when headlights or position lights are switched on
- 02394 stored in the body control module -- no dashboard warning lamp in many markets (parking light fault may not trigger a cluster icon on the Scirocco)
- Possible 'Bulb Failure' indicator on instrument cluster if the market-specific cluster is equipped to display it
- All other lights in the left front cluster (headlight, indicator) continue to function normally
Common causes
- Burned-out W5W (T10, 5 W) bulb filament -- the dominant cause on any vehicle with more than 50,000 km
- Corroded bayonet socket inside the headlight housing preventing reliable contact between the bulb base and socket terminals
- Broken bulb holder plastic tabs allowing the bulb to twist loose from its socket
- Damaged wiring at the headlight harness connector or inside the housing due to moisture ingress
- BCM lamp driver circuit fault -- extremely rare; always replace the bulb first
Diagnostic approach
- Visually inspect the left front parking lamp bulb — Access the rear of the left headlight housing from the engine bay on the 2010 Scirocco -- the front bumper does not need removal. Remove the rubber dust cover, locate the W5W parking lamp holder (smallest socket, typically outermost), pull it out, and inspect the bulb filament. A visually broken filament confirms the fault.
- Inspect the bulb socket for corrosion — Even if the bulb appears intact, remove it and inspect the two socket contacts (centre pin and outer ring) for green corrosion or carbon deposits. Clean with a small wire brush or contact cleaner, then reinsert the bulb and retest before replacing the entire socket assembly.
- Verify the circuit with a test lamp if the new bulb does not light — With a known-good W5W bulb fitted and the lights switched on, if the parking light still does not illuminate, probe the socket contacts with a test lamp. No illumination at the socket confirms a wiring or BCM output fault upstream of the bulb.
Make & model notes
Volkswagen: The 2010 Scirocco uses the same 1K platform electrical architecture as the Mk5/Mk6 Golf. The parking lamp bulb is a standard W5W (T10) bayonet fit. Retrofitting standard LED T10 bulbs may re-generate fault 02394 because the ZAS current-sensing circuit expects the higher current draw of a filament bulb. CANBUS-compatible LED T10s with built-in resistors are needed if you prefer LEDs.
Volkswagen: On the Scirocco 1K8, the headlight housing is a single piece requiring clip release from the inner wing if a full housing change is needed. For a simple parking bulb replacement, the housing does not need to be removed -- access the dust cap at the rear of the housing from the engine bay and the W5W holder is the smallest socket.
FAQ
What bulb does the 2010 VW Scirocco left front parking light use?
The left front parking/side marker light on the 2010 Scirocco uses a W5W (also known as T10 or 501) 12 V 5 W bulb with a bayonet (push-and-twist) fitting. Standard replacements from Osram, Philips, or Bosch fit without modification.
Will fault 02394 clear itself once I replace the bulb?
Usually yes. The BCM re-checks lamp circuits every time the parking lights are switched on. If the new bulb is seated correctly and the circuit current is within range, the fault will be cleared automatically on the next switch-on cycle without needing a scan tool reset.
Can LED bulbs cause fault 02394 on a VW Scirocco?
Yes. Standard LED T10 bulbs draw far less current than a 5 W filament bulb, so the BCM's current sensor reads them as a failed lamp and sets 02394 even though the light appears to work. To use LEDs without fault codes, you need CANBUS-compatible LED T10 bulbs with an integrated resistor.