Spark plugs VW Golf IV AGR (1.9 TDI) — NGK, Bosch, Denso
Spark plugs for VW Golf IV AGR (1.9 TDIL, 1997–2004) — OEM-spec NGK, Bosch, Denso and Champion part numbers with replacement interval.
Engine Specifications
| Parameter | Value |
|---|---|
| Make / Model | VW Golf IV |
| Engine Code | AGR |
| Displacement / Fuel | 1.9 TDIL diesel |
| Production Years | 1997–2004 |
| Plug type | iridium |
| Thread | M14x1.25 |
| Reach | 19 mm |
| Hex size | 16 mm |
| Electrode gap | 0.7 mm |
| Heat range | 5 |
Compatible Spark Plugs
| Brand | Part Number | Type |
|---|---|---|
| NGK | NGK BKUR6ET | OE supplier |
| Bosch | Bosch 0242236648 | OE supplier |
| Denso | Denso IK20TT | OE supplier |
| Champion | Champion RG59PYP4 | aftermarket |
Replacement Interval
| Parameter | Value |
|---|---|
| Mileage | 60 000 km |
| Time | 4 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 AGR
- Use the correct plug type — the AGR 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 VW Golf IV AGR?
NGK NGK BKUR6ET, Bosch Bosch 0242236648, Denso Denso IK20TT. All three are OE suppliers and guarantee compatibility with this engine.
How often should spark plugs be replaced on VW Golf IV?
Every 60 000 km or 4 years, whichever comes first. Iridium plugs (NGK BKUR6ET) have a longer service life compared to standard nickel plugs.
Can I fit a different type of spark plug in the AGR?
Upgrading to iridium or platinum is acceptable and gives a slight improvement in cold starts. Do not change the heat range (5) — an incorrect heat range can cause pre-ignition or fouling.
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