- Shop with confidence: competitive prices, exclusive deals, and delivery perks.
- Need it quickly? We dispatch fast-moving parts daily. Check delivery options.
- Swap or return items within the standard return period with a simple process.
- Questions about fitment or orders? Our support team is ready to help.
Similar products
Customers also bought
Details
| Specification | Value |
|---|---|
| Brand | BOSCH |
| Category | O2 Sensor |
| Overall Length [mm] | 650 mm |
| Recommended change interval [km] | 100000 km |
OE/OEM numbers (6)
Search by this OE number to find compatible parts
- VW—021 906 265 B
- VW—021 906 265 J
- SEAT / VW—021 906 265 N
- AUDI / SEAT / SKODA / VW—030 906 265 T
- SKODA / VW—441 0 4165 019 6
- MAZDA—FSC1-18-861B
Where this part fits
Original-fit position for OE 021906265N. The red ring marks where this part installs on the vehicle.
About this product
Sourced from BOSCH, this o2 sensor (0 258 003 439) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Overall Length [mm]: 650 mm, Number of circuits: Copper, Recommended change interval [km]: 100000 km, Available as universal article as well, see article no.: 0258986503 — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit MAZDA, SEAT, SKODA, VW models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 01 0 3635, 01 0 3642, 0172, 021 906 265 B and 40 more. Matching these numbers confirms a like-for-like replacement with no loss of function. BOSCH 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.
About BOSCH
Robert Bosch GmbH, founded in 1886 in Stuttgart, Germany, is one of the world's largest automotive parts suppliers. Bosch specialises in braking systems, fuel injection, spark plugs, alternators, and electronic engine management. As an OE supplier to virtually every major car manufacturer, Bosch parts meet or exceed original equipment specifications. With over 130 years of engineering innovation, choosing Bosch means choosing proven reliability backed by extensive research and development.
Suitable cars
Equivalent products (37)
Show all 37 OE numbers
O2 Sensor BOSCH 0 258 003 439 — compatible car models
| Car models | MAZDA: XEDOS 6 (CA); SEAT: CORDOBA (6K1, 6K2), IBIZA II (6K1); SKODA: FAVORIT Estate Van (785), FAVORIT Forman (785); VW: GOLF III (1H1), GOLF III Van (1H1), GOLF III Variant (1H5), GOLF Van III Variant (1H5), PASSAT B3/B4 (3A2, 35I), PASSAT B3/B4 Variant (3A5, 35I), VENTO (1H2) |
|---|---|
| Engines | 1.6 16V; 1.3; 1.0; 1.4; 1.6; 2.0 16V |
| Year of manufacture | 1988-2002 |
| Manufacturer article number (MPN) | 0 258 003 439 |
| OE part numbers | 021 906 265 B, 021 906 265 J, 021 906 265 N, 030 906 265 T, 441 0 4165 019 6, FSC1-18-861B |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
BOSCH 0258003439 O2 Sensor. Available as universal article as well, see article no.: 0258986503. Number of circuits: 4. Overall Length [mm]: 650 mm. Recommended change interval [km]: 100000 km
- 1x O2 Sensor
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 O2 Sensor compatible with my car?
This O2 Sensor fits MAZDA, SEAT, SKODA, VW 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 BOSCH O2 Sensor have?
This BOSCH O2 Sensor has the following specifications: Overall Length [mm]: 650 mm; Number of circuits: 4; Recommended change interval [km]: 100000 km; Available as universal article as well, see article no.: 0258986503. Check the full specifications table above for complete details.
What OE part numbers does this O2 Sensor replace?
This O2 Sensor replaces OE part numbers: 021 906 265 B, 021 906 265 J, 021 906 265 N, 030 906 265 T, 441 0 4165 019 6, FSC1-18-861B. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a O2 Sensor cost?
This BOSCH O2 Sensor is available for £61.99. O2 Sensor prices vary depending on brand, specifications, and vehicle compatibility. BOSCH parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my O2 Sensor?
Symptoms include increased fuel consumption, rough idle, failed emissions test, check engine light, or reduced engine performance.
What tools do I need to replace a O2 Sensor?
Tools needed: lambda sensor socket wrench (22mm slotted), penetrating oil (apply 24 hours before removal on vehicles with high mileage or corrosion), oxygen sensor thread chaser, torque wrench (40-55 Nm), OBD-II scanner. Difficulty: Moderate DIY. Safety warning: Only remove on a fully cold exhaust. Apply penetrating oil the day before on older vehicles to avoid breaking the sensor in the bung -- a broken sensor requires professional extraction equipment.
Can I use this part as a replacement for OE 021 906 265 B?
Yes, this BOSCH O2 Sensor is a direct replacement for OE part number 021 906 265 B. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Is the BOSCH 0 258 003 439 the same as the BOSCH 0 258 001 051?
No, while both are O2 Sensor parts, they are different products. The BOSCH 0 258 003 439 has Overall Length [mm]: 650 mm, Number of circuits: 4, Recommended change interval [km]: 100000 km. The BOSCH 0 258 001 051 may differ in dimensions, fitting position, or material composition. Always verify compatibility with your specific vehicle using our vehicle selector, or contact our customer service team for assistance.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
