Bosch 15827 Premium OE Switching-Type Oxygen Sensor 4-Wire

The Bosch 15827 is a premium switching-type (narrowband) oxygen sensor engineered to deliver precise air-fuel ratio feedback to your vehicle's ECU. As the original inventor of the automotive oxygen sensor, Bosch brings more than five decades of OE development experience to every sensor in its lineup, ensuring aftermarket quality that matches — or exceeds — factory specifications.

Key Features:

• OE-Trusted Technology: Bosch has supplied oxygen sensors to OE vehicle manufacturers for over 50 years, setting the standard for lambda-control systems worldwide
• Precision Air-Fuel Control: Delivers accurate switching-type signals to the ECU for stable closed-loop combustion control and reduced emissions
• Stainless Steel Housing: Double laser-welded stainless steel body is fully submersible and sealed to protect against exhaust contamination and extend sensor service life
• Advanced Ceramic Element: Base ceramic probe constructed from zirconium and yttrium oxides for exceptional durability under extreme heat and vibration
• Fast Heater Response: Integrated heater element brings the sensor to operating temperature in under 10 seconds, enabling rapid closed-loop control and improved cold-start emissions
• High-Temperature Rated: Built to withstand exhaust stream temperatures up to 1,880°F with TSP coating to resist vibration, corrosion, and contamination
• Direct-Fit Installation: OE-style connector and 10-inch wiring harness with threads pre-coated in anti-seize compound for straightforward, no-hassle replacement
• 100% Tested: Every sensor undergoes a full functional test and leak test to verify environmental and operational integrity before leaving the factory

Specifications:

• Sensor Type: Narrowband / Switching-Type
• Wire Quantity: 4
• Wire Harness Length: 10 inches (254 mm)
• Overall Length: 13.3 inches (337.82 mm)
• Thread Diameter: 18 mm
• Hex Size: 22 mm
• Terminal Type: Blade (Male)
• Connector Shape: Oblong (Male)
• Mounting Type: Threaded
• Housing Material: Stainless Steel
• Heated: Yes
• OE Cross-Reference: 25203197
• UPC: 731413633676

The Bosch 15827 oxygen sensor is a direct-fit OE replacement designed to restore proper emissions control and fuel efficiency. Whether used as an upstream or downstream replacement, it meets or exceeds original equipment specifications for a broad range of domestic, European, and Asian vehicle applications.