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Details
| Specification | Value |
|---|---|
| Brand | HART |
| Category | O2 Sensor |
| Overall Length [mm] | 720 mm |
OE/OEM numbers (10)
Search by this OE number to find compatible parts
- VW—025800508276W
- AUDI / SEAT / SKODA / VW—030 906 265 BS
- AUDI / SEAT / SKODA / VW—030 906 265 BT
- VW / AUDI / SEAT / SKODA—036 906 265
- VW / AUDI / SEAT / SKODA—06A 906 265
- AUDI / SEAT / SKODA / VW—06A 906 265 B
- AUDI / SEAT / SKODA / VW—06A 906 265 F
- AUDI / SEAT / SKODA / VW—06A 906 265 G
- AUDI / SEAT / SKODA / VW—06A 906 265 H
- FORD—98VW 9F472 AA
Where this part fits
Original-fit position for OE 030906265BS. The red ring marks where this part installs on the vehicle.
About this product
HART O2 Sensor (529 431) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Overall Length [mm]: 720 mm, Number of circuits: Copper — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with AUDI, SEAT, SKODA, VW 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: 025800508276W, 030 906 265 BS, 030 906 265 BT, 036 906 265 and 9 more. Matching these numbers confirms a like-for-like replacement with no loss of function. HART 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.
Suitable cars
No equivalent parts found.
O2 Sensor HART 529 431 — compatible car models
| Car models | AUDI: A3 (8L1); SEAT: AROSA (6H1), CORDOBA (6K1, 6K2), CORDOBA Vario (6K5), IBIZA II (6K1), INCA (6K9), LEON (1M1), TOLEDO II (1M2); SKODA: OCTAVIA I (1U2), OCTAVIA I Combi (1U5); VW: BORA I (1J2), BORA Variant (1J6), CADDY II Box Body/MPV (9K9A), CADDY II MPV (9K9B), GOLF IV (1J1), GOLF IV Variant (1J5), LUPO I (6X1, 6E1), POLO III (6N1), POLO III CLASSIC (6V2), POLO Variant (6V5) |
|---|---|
| Engines | 1.8; 1.0; 1.0 i; 1.4 i; 1.0 16V; 1.8 20V; 1.6; 1.8 4motion; 60 1.4; 1.4; 1.8 T; 100 1.4 16V; 54 1.4 |
| Year of manufacture | 1993-2013 |
| Manufacturer article number (MPN) | 529 431 |
| OE part numbers | 025800508276W, 030 906 265 BS, 030 906 265 BT, 036 906 265, 06A 906 265, 06A 906 265 B, 06A 906 265 F, 06A 906 265 G, 06A 906 265 H, 98VW 9F472 AA |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
HART 529431 O2 Sensor. Number of circuits: 4. Overall Length [mm]: 720 mm
- 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 AUDI, 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 HART O2 Sensor have?
This HART O2 Sensor has the following specifications: Overall Length [mm]: 720 mm; Number of circuits: 4. 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: 025800508276W, 030 906 265 BS, 030 906 265 BT, 036 906 265, 06A 906 265, 06A 906 265 B, 06A 906 265 F, 06A 906 265 G and 2 more. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a O2 Sensor cost?
This HART O2 Sensor is available for £45.99. O2 Sensor prices vary depending on brand, specifications, and vehicle compatibility. HART 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 025800508276W?
Yes, this HART O2 Sensor is a direct replacement for OE part number 025800508276W. 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.
