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Details
| Specification | Value |
|---|---|
| Brand | DENSO |
| MPN | dg-121 |
| Voltage [V] | 10 V |
| Connector type | Thread |
| Thread Size | M10x1.0 |
| Overall Length [mm] | 95 mm |
| Weight [g] | 26.3 g |
| Version | Double coil |
| Tightening torque from [Nm] | 10 Nm |
| Tightening torque to [Nm] | 12 Nm |
| alternative item | - |
OE/OEM numbers (2)
Search by this OE number to find compatible parts
- FORD—1079401
- FORD—XS4U6M090AB
Where this part fits
Original-fit position for OE 1079401. The red ring marks where this part installs on the vehicle.
About this product
DENSO Glow Plug (DG-121) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Voltage [V]: Brass V, for OE number: 1079401, Connector type: Thread, Thread Size: M10x1.0, Overall Length [mm]: 95 mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with FORD vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 0100226301, 0100226384, 0 250 202 131, 1079401 and 13 more. Matching these numbers confirms a like-for-like replacement with no loss of function. DENSO is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
Glow Plug buying guide
Why replace this part?
Glow plugs pre-heat diesel combustion chambers to ensure reliable cold starting and clean combustion on startup. Worn glow plugs cause difficult cold-weather starting, white smoke on startup, and increased wear on starter motors.
Signs you need a replacement
- Difficult starting in cold weather
- white or blue smoke on cold start
- glow plug warning light staying on
- engine misfiring during warm-up
- increased starter motor cranking time
When to replace
Every 60,000–80,000 miles or when cold-starting problems develop. Replace all plugs as a set — a single failed plug causes uneven cylinder temperatures.
About DENSO
DENSO Corporation, founded in 1949 in Kariya, Japan, is one of the largest automotive component manufacturers in the world and a core member of the Toyota Group. DENSO specialises in spark plugs, alternators, starters, air conditioning systems, fuel pumps, and oxygen sensors. As the OE supplier to Toyota, Honda, Subaru, and many European manufacturers, DENSO products are built to exact original specifications. Choosing DENSO means factory-grade quality with Japanese precision engineering and global reliability.
Suitable cars
Equivalent products (15)
Glow Plug DENSO DG-121 — compatible car models
| Car models | FORD: C-MAX (DM2), FIESTA Hatchback Van (JV), FOCUS C-MAX (DM2), FOCUS I (DAW, DBW), FOCUS II (DA, HCP, DP), FOCUS II Saloon (DB, FCH, DH), FOCUS II Turnier (DA, FFS, DS), FOCUS I Saloon (DFW), FOCUS I Turnier (DNW), GALAXY II (WA6) (+6 more) |
|---|---|
| Engines | 1.8 TDCi; TD 1.8; 1.8 DI / TDDi; 1.8 Di |
| Year of manufacture | 1998-2015 |
| Manufacturer article number (MPN) | DG-121 |
| OE part numbers | 1079401, XS4U6M090AB |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
DENSO dg-121 . alternative item: -. Connector type: Thread. for OE number: 1079401. Glow Plug Design: 2. Overall Length [mm]: 95 mm. Spanner Size: 10. Thread Size: M10x1.0. Tightening torque from [Nm]: 10 Nm
- 1x Glow Plug
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Glow Plug compatible with my car?
This Glow Plug fits FORD vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this DENSO Glow Plug have?
This DENSO Glow Plug has the following specifications: Voltage [V]: 10 V; for OE number: 1079401; Connector type: Thread; Thread Size: M10x1.0; Overall Length [mm]: 95 mm; Spanner Size: 10. Check the full specifications table above for complete details.
What OE part numbers does this Glow Plug replace?
This Glow Plug replaces OE part numbers: 1079401, XS4U6M090AB. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Glow Plug cost?
This DENSO Glow Plug is available for £13.99. Glow Plug prices vary depending on brand, specifications, and vehicle compatibility. DENSO parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Glow Plug?
On diesel engines: difficulty starting in cold weather, excessive white smoke from the exhaust on startup, rough running until the engine warms, the glow plug warning light staying on, or one cylinder misfiring when cold.
What tools do I need to replace a Glow Plug?
Tools needed: 10mm hex deep socket for glow plug, torque wrench (10-15 Nm), penetrating oil (apply 24 hours before removal on high-mileage engines), glow plug extraction kit (for seized plugs). Difficulty: Moderate DIY. Safety warning: Apply penetrating oil well in advance on older diesel engines -- forced removal of seized glow plugs snaps them in the cylinder head, requiring specialist extraction. Never over-torque replacements.
Can I use this part as a replacement for OE 1079401?
Yes, this DENSO Glow Plug is a direct replacement for OE part number 1079401. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
