This page lists 6 ignition parts for the 2018 Audi A8, across 4 part types, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Every part shows its brand, manufacturer part number and fitment notes.
The ignition system on the 2018 Audi A8 delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. The largest groups are Camshaft Position Sensor (2 parts), Ignition Coil (2 parts) and Crankshaft Position Sensor (1 part). The other 1 part type covers the remaining 1 part.
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.
5 brands supply ignition parts for the 2018 Audi A8, led by MARELLI (2 parts), KARLYN / BREMI / STI (1 part) and SPECTRA PREMIUM (1 part), plus 2 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2018 Audi A8 opens a page with every vehicle that part fits.
Camshaft Position Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MARELLI Fits: 6.3L W12 | SAC011 | 🇲🇽 MX | View on Amazon | |
| MARELLI Fits: 6.3L W12 | SAC120 | 🇲🇽 MX | View on Amazon |
This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
2 Camshaft Position Sensor parts for the 2018 Audi A8 come from MARELLI.
Part numbers include MARELLI SAC011 and MARELLI SAC120.
Crankshaft Position Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KARLYN / BREMI / STI Fits: 6.3L W12 | 60500 | 🇲🇽 MX | Bremi | View on Amazon |
This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
This group shows a single part: KARLYN / BREMI / STI 60500.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: 6.3L W12 | C973 | 🇲🇽 MX | Ignition Coil Mounts to Cylinder Head | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS Fits: 6.3L W12 | COP409 | 🇲🇽 MX | Mount Type: PLUG-IN | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
2 Ignition Coil parts for the 2018 Audi A8 come from 2 brands — SPECTRA PREMIUM and UNITED MOTOR PRODUCTS.
The Economy section lists 1 option from SPECTRA PREMIUM — the catalog's value-priced group. SPECTRA PREMIUM C973 is listed in this group.
In the Standard Replacement grade, UNITED MOTOR PRODUCTS supplies 1 part: built to original-equipment specification. A representative part number is UNITED MOTOR PRODUCTS COP409.
This group includes SPECTRA PREMIUM C973 and UNITED MOTOR PRODUCTS COP409.
Spark Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Fits: 6.3L W12 | 94290 | 🇲🇽 MX | Laser IridiumPre-Set Gap: 0.032" | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
One part is listed for the 2018 Audi A8 — NGK 94290.
Buying Ignition Parts for a 2018 Audi A8
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Match the engine first. Every ignition 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, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Camshaft Position Sensor and Ignition Coil .
Frequently Asked Questions
How many ignition parts fit the 2018 Audi A8?
Our catalog currently lists 6 ignition parts for the 2018 Audi A8 across 4 subcategories and 5 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 ignition parts differ between 2018 Audi A8 engines?
Yes. Every ignition 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 ignition problems on a 2018 Audi A8?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 2018 Audi A8?
Notes on this page include a 0.032" pre-set gap. Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
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 gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Audi A8
Ignition Parts for Other Audi A8 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.