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Details
| Specification | Value |
|---|---|
| Brand | FAE |
| Category | O2 Sensor |
| Length [mm] | 850 mm |
| Number of pins | 4 -pin connector |
| Technical Information Number | Universal 77008 |
OE/OEM numbers (2)
Search by this OE number to find compatible parts
- BMW—11 781 721 125
- BMW—11 781 734 796
Where this part fits
Original-fit position for OE 11781734796. The red ring marks where this part installs on the vehicle.
About this product
Sourced from FAE, this o2 sensor (77174) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Length [mm]: 850 mm, Number of pins: Copper -pin connector, Technical Information Number: Universal 77008 — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit BMW 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: 0238, 0258 003 069, 0258 003 261, 0264 and 33 more. Matching these numbers confirms a like-for-like replacement with no loss of function. FAE 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
Equivalent products (35)
Show all 35 OE numbers
O2 Sensor FAE 77174 — compatible car models
| Car models | BMW: 3 Convertible (E30), 3 (E30), 3 Touring (E30), 5 (E34), 5 Touring (E34), 8 (E31), Z1 Roadster |
|---|---|
| Engines | 318 i; 316 i; 518 i; 518 g; 850 CSi; 2.5 |
| Year of manufacture | 1982-1999 |
| Manufacturer article number (MPN) | 77174 |
| OE part numbers | 11 781 721 125, 11 781 734 796 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
FAE 77174 O2 Sensor. Length [mm]: 850 mm. Number of pins: 4 -pin connector. Technical Information Number: Universal 77008
- 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 BMW 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 FAE O2 Sensor have?
This FAE O2 Sensor has the following specifications: Length [mm]: 850 mm; Number of pins: 4 -pin connector; Technical Information Number: Universal 77008. 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: 11 781 721 125, 11 781 734 796. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a O2 Sensor cost?
This FAE O2 Sensor is available for £83.99. O2 Sensor prices vary depending on brand, specifications, and vehicle compatibility. FAE 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 11 781 721 125?
Yes, this FAE O2 Sensor is a direct replacement for OE part number 11 781 721 125. 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.
