/live/media/NO/NO_25530_Fro.jpg)
Will it fit your vehicle?
Confirm before you buy. Free return shipping if it doesn't fit.
NTK 25530 Oxygen Sensor - Upstream
| Brand | NTK 25530 |
|---|---|
| Position | Upstream |
| Wiring Harness Length | 32.5000 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Thread Diameter | 18.000 |
| Mounting Type | Threaded |
| Product line | Direct Fit Oxygen Sensor |
| Fits | BMW · 3 vehicles |
Direct fit design. Specific fit for easier installation and a cleaner replacement.
Heated sensor. Helps the oxygen sensor reach operating temperature quickly.
Threaded mounting. Provides a secure, straightforward installation.
Cross-references Bosch 13109, DENSO Auto Parts 234-4674 and 75-2792 for the same application. See all 9.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct Fit Oxygen Sensor for BMW 318i and 318is
The NTK Direct Fit Oxygen Sensor 25530 is a heated, threaded replacement sensor built for specific-fit applications. It matches the OE-style configuration for 1991-1992 BMW 318i and 1991 BMW 318is upstream positions, including B1S1 coverage with an 800 mm sensor lead noted in fitment.
Key Features
- Specific-fit oxygen sensor for direct replacement service
- Heated sensor design for faster operating response
- 4-wire configuration for OE-style signal and heater circuit layout
- 18 mm threaded mounting type
- 32.5 in. wiring harness length
- Upstream placement for BMW 318i and 318is applications
Product Details
NTK part number 25530 is part of the Direct Fit Oxygen Sensor line, a product range focused on OE-style replacement coverage and application-specific fitment. NTK develops oxygen sensors with ceramic manufacturing expertise and extensive production testing to help maintain fit, form, and function aligned with original equipment expectations. For BMW 318i and BMW 318is owners, this sensor is specified for upstream use and direct-fit installation on the listed applications.
This part cross-references Bosch 13109 and DENSO Auto Parts 234-4674 for the same application.
Common Issues This Sensor Can Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel mixture readings from a worn upstream sensor
- Slow sensor response during closed-loop operation
- Driveability concerns tied to aging exhaust feedback data
- Failed emissions inspection caused by a degraded oxygen sensor
Installation Notes and Tips
Verify the vehicle is a 1991-1992 BMW 318i or 1991 BMW 318is with upstream B1S1 placement before ordering NTK 25530. Confirm the 4-wire connector style, 18 mm threaded mounting, and harness length against the original sensor to ensure proper routing and connection. Use the vehicle’s existing exhaust sensor location and follow factory service procedures for removal and installation.
Quality Assurance
NTK is a major original equipment oxygen sensor manufacturer, and this sensor is manufactured and tested to meet or exceed OE specifications for the listed applications. The Direct Fit Oxygen Sensor line is built to support accurate replacement on import and domestic vehicles, including BMW 318i and BMW 318is coverage.
| Year | Make | Model | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1992 | BMW | 318i | Convertible | 1.8L | L4 | Upstream | B1S1; Sensor w/800mm Length; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1991 | BMW | 318i | — | 1.8L | L4 | Upstream | B1S1; w/800mm Length; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1991 | BMW | 318is | — | 1.8L | L4 | Upstream | B1S1; w/800mm Length; OE Equivalent Design; Direct Fit Oxygen Sensor |
| No rows match your filter. | |||||||