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Details
| Specification | Value |
|---|---|
| Brand | NTK |
| Category | O2 Sensor |
| Length [mm] | 475 mm |
OE numbers (2)
Where this part fits
Original-fit position for OE 4239042.
About this product
The NTK O2 Sensor (1639) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Length [mm]: 475 mm, Oxygen Sensor: Carbon, Number of circuits: Cast Iron. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Verified to fit SAAB 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: 0 258 003 328, 0 258 005 328, 0 258 005 334, 0 258 986 502 and 66 more. Matching these numbers confirms a like-for-like replacement with no loss of function. NTK 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 with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Suitable cars
Equivalent products (72)
Show all 72 OE numbers
O2 Sensor NTK 1639 — compatible car models
| Car models | SAAB: 9000, 9000 Hatchback, 900 II, 900 II Convertible, 900 II Coupe, 9-3 Cabriolet (YS3D), 9-3 (YS3D) |
|---|---|
| Engines | 2.3 -16 CD; 2.3; 2.0 -16 Turbo; 2.0 i |
| Year of manufacture | 1984-2003 |
| Manufacturer article number (MPN) | 1639 |
| OE part numbers | 42 39 042, 91 46 937 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
NTK 1639 O2 Sensor. Length [mm]: 475 mm. Number of circuits: 3. Oxygen Sensor: 8
- 1x O2 Sensor
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 5–9 business days
- Order before 5pm — ships the next working day
- 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 SAAB 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 NTK O2 Sensor have?
This NTK O2 Sensor has the following specifications: Length [mm]: 475 mm; Oxygen Sensor: 8; Number of circuits: 3. 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: 42 39 042, 91 46 937. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a O2 Sensor cost?
This NTK O2 Sensor is available for £93.99. O2 Sensor prices vary depending on brand, specifications, and vehicle compatibility. NTK 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 42 39 042?
Yes, this NTK O2 Sensor is a direct replacement for OE part number 42 39 042. 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.
