The 2018 Audi A8 has 35 electrical parts with verified fitment on this page — 6 part types and 14 brands, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Each part includes a manufacturer part number and application notes.
On the 2018 Audi A8, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. 31 parts of the 35 listed are Battery (20 parts), Parking Aid Sensor (8 parts) and Lighting Control Module (LCM) (3 parts). The other 3 part types cover the remaining 4 parts.
The 2018 Audi A8 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Audi A8 electrical parts are MARELLI (5 parts), VEMO (4 parts) and DEKA (3 parts), plus 11 more brands. Quality grades include AGM and Performance AGM.
6 parts on this 2018 Audi A8 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DEKA 9A94R (Battery) and VALEO 890001 (Parking Aid Sensor). Click any part number to see every vehicle that part fits.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular Fits: 6.3L W12 | 9A94R | 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| FVP Popular Fits: 6.3L W12 | P94RAGM | 🇲🇽 MX | Platinum AGMBCI Group: 94R | View on Amazon |
| LUCAS Popular Fits: 6.3L W12 | LBAGM005A | 🇲🇽 MX | BCI Group: 94RAGM | View on Amazon |
| LUCAS Popular Fits: 6.3L W12 | LBAGM006A | 🇲🇽 MX | BCI Group: 49AGM | View on Amazon |
| BOSCH Fits: 6.3L W12 | S6587B | 🇲🇽 MX | AGMAGM | View on Amazon |
| BOSCH Fits: 6.3L W12 | S6588B | 🇲🇽 MX | AGMAGM | View on Amazon |
| DEKA Fits: 6.3L W12 | 9A49 | 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| DEKA Fits: 6.3L W12 | 9A95R | 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| EXIDE Fits: 6.3L W12 | MXH7L494R | 🇲🇽 MX | Marathon MaxBCI Group 94R (H7) | View on Amazon |
| EXIDE Fits: 6.3L W12 | MXH8L549 | 🇲🇽 MX | Marathon MaxBCI Group 49 (H8) | View on Amazon |
| EXIDE Fits: 6.3L W12 | MXH9L695R | 🇲🇽 MX | Marathon MaxBCI Group 95R (H9) | View on Amazon |
| FVP Fits: 6.3L W12 | P49AGM | 🇲🇽 MX | Platinum AGMBCI Group: 49 | View on Amazon |
| LUCAS Fits: 6.3L W12 | LBAGM007A | 🇲🇽 MX | BCI Group: 95RAGM | View on Amazon |
| MOTORCRAFT Fits: 6.3L W12 | BAGM49H8 | 🇲🇽 MX | Tested Tough AGMBCI Group: 49/H8 or BCI Group 49 | View on Amazon |
| MOTORCRAFT Fits: 6.3L W12 | BAGM95RH9 | 🇲🇽 MX | Tested Tough AGMBCI Group 95R or BCI Group: 95R/H9 | View on Amazon |
| P1MAX Fits: 6.3L W12 | PMAGMH794R | 🇲🇽 MX | BCI Group 94R AGM800 CCA | View on Amazon |
| P1MAX Fits: 6.3L W12 | PMAGMH849 | 🇲🇽 MX | BCI Group 49 AGM850 CCA | View on Amazon |
| P1MAX Fits: 6.3L W12 | PMAGMH995R | 🇲🇽 MX | BCI Group 95R AGM950 CCA | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER Fits: 6.3L W12 | FT85094R | 🇲🇽 MX | BCI Group 94R(Length X Width X Height) 12.36 In x 6.85 In x 7.48 In | View on Amazon |
| FULLRIVER Fits: 6.3L W12 | FT89049 | 🇲🇽 MX | BCI Group 49(Length X Width X Height) 13.9 In x 6.89 In x 7.48 In | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
20 Battery parts for the 2018 Audi A8 come from 8 brands — DEKA, LUCAS, EXIDE and 5 other brands. The "Popular" part is DEKA 9A94R.
In the AGM (Extended Life) grade, DEKA, LUCAS, EXIDE and 4 other brands supply 18 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A94R.
In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 2 parts: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT85094R.
Battery Current Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 6.3L W12 | 5S16134 | 🇲🇽 MX | Negative Circuit | View on Amazon |
| WELLS Fits: 6.3L W12 | 5S16149 | 🇲🇽 MX | Positive Circuit | View on Amazon |
This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
WELLS supplies both parts for the 2018 Audi A8.
Listed part numbers: WELLS 5S16134 and WELLS 5S16149.
HID Lighting Ballast
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 6.3L W12 | V10730387KIT1 | 🇲🇽 MX | Includes: Control Module, Xenon Lamp and Installation Hardware | View on Amazon |
This table covers the HID Lighting ballasts.
One part is listed for the 2018 Audi A8 — VEMO V10730387KIT1.
Lighting Control Module (LCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MARELLI Fits: 6.3L W12 | LRB400 | 🇲🇽 MX | Xenon | View on Amazon |
| VEMO Fits: 6.3L W12 | V10730536 | 🇲🇽 MX | Left | View on Amazon |
| VEMO Fits: 6.3L W12 | V10730387KIT1 | 🇲🇽 MX | Includes: Control Module, Xenon Lamp and Installation Hardware | View on Amazon |
This table covers the modules that control the exterior lighting.
3 Lighting Control Module (LCM) parts are listed for the 2018 Audi A8, from VEMO and MARELLI.
This group includes MARELLI LRB400, VEMO V10730536 and VEMO V10730387KIT1.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALEO Popular Fits: 6.3L W12 | 890001 | 🇲🇽 MX | Park Sensor | View on Amazon |
| VALEO Popular Fits: 6.3L W12 | 890000 | 🇲🇽 MX | Park Sensor | View on Amazon |
| MARELLI Fits: 6.3L W12 | SDP002 | 🇲🇽 MX | Front | View on Amazon |
| MARELLI Fits: 6.3L W12 | SDP018 | 🇲🇽 MX | Fits Right | View on Amazon |
| MARELLI Fits: 6.3L W12 | SDP097 | 🇲🇽 MX | Fits Right | View on Amazon |
| MARELLI Fits: 6.3L W12 | SDP100 | 🇲🇽 MX | Fits RightFrom 09/2014 | View on Amazon |
| TECHPRO Fits: 6.3L W12 | AU1075105 | 🇲🇽 MX | Customer Paints to Match | View on Amazon |
| ÜRO PARTS Fits: 6.3L W12 | 1S0919275D | 🇲🇽 MX | Front InnerElectrical Components | View on Amazon |
This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
8 Parking Aid Sensor parts are listed for the 2018 Audi A8, from MARELLI, VALEO, TECHPRO and 1 other brand. VALEO 890001 carries the "Popular" badge.
Part numbers include VALEO 890001, VALEO 890000 and MARELLI SDP002, among others listed above.
Rain Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 6.3L W12 | V10721604 | 🇲🇽 MX | with Holder | View on Amazon |
This table covers the Rain sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
One part is listed for the 2018 Audi A8 — VEMO V10721604.
Buying Electrical Parts for a 2018 Audi A8
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Every electrical part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Battery and Parking Aid Sensor .
Frequently Asked Questions
How many electrical parts fit the 2018 Audi A8?
Our catalog currently lists 35 electrical parts for the 2018 Audi A8 across 6 subcategories and 14 brands, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2018 Audi A8 engines?
Yes. Every electrical part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 2018 Audi A8?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Audi A8 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Audi A8?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Audi A8
Electrical Parts for Other Audi A8 Years
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