Spark plugs Audi A4 B8 CDNB (1.8 TFSI) — NGK, Bosch, Denso
Spark plugs for Audi A4 B8 CDNB (1.8 TFSIL, 2008–2015) — OEM-spec NGK, Bosch, Denso and Champion part numbers with replacement interval.
Engine Specifications
| Parameter | Value |
|---|---|
| Make / Model | Audi A4 B8 |
| Engine Code | CDNB |
| Displacement / Fuel | 1.8 TFSIL petrol |
| Production Years | 2008–2015 |
| Plug type | iridium |
| Thread | M14x1.25 |
| Reach | 26.5 mm |
| Hex size | 16 mm |
| Electrode gap | 0.7 mm |
| Heat range | 7 |
Compatible Spark Plugs
| Brand | Part Number | Type |
|---|---|---|
| NGK | NGK ILZKBR7B8DGS | OE supplier |
| Bosch | Bosch 0242236565 | OE supplier |
| Denso | Denso IK20TT | OE supplier |
| Champion | Champion RG59PYP4 | aftermarket |
Replacement Interval
| Parameter | Value |
|---|---|
| Mileage | 40 000 km |
| Time | 2 years |
Iridium and platinum plugs last 2–3× longer than standard copper plugs. Replace them on schedule — worn plugs increase fuel consumption by 3–5% and reduce power output.
Choosing Spark Plugs for CDNB
- Use the correct plug type — the CDNB requires iridium plugs. Upgrading from standard to iridium is acceptable.
- Check the electrode gap — verify the gap is 0.7 mm before installation.
- Torque correctly — for M14x1.25 thread: aluminium head 20–25 Nm, cast iron head 25–30 Nm.
- Replace as a full set — always replace all cylinders at once to ensure even combustion across all cylinders.
FAQ
Which spark plugs fit Audi A4 B8 CDNB?
NGK NGK ILZKBR7B8DGS, Bosch Bosch 0242236565, Denso Denso IK20TT. All three are OE suppliers and guarantee compatibility with this engine.
How often should spark plugs be replaced on Audi A4 B8?
Every 40 000 km or 2 years, whichever comes first. Iridium plugs (NGK ILZKBR7B8DGS) have a longer service life compared to standard nickel plugs.
Can I fit a different type of spark plug in the CDNB?
Upgrading to iridium or platinum is acceptable and gives a slight improvement in cold starts. Do not change the heat range (7) — an incorrect heat range can cause pre-ignition or fouling.
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