Bosch 13181 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13181

Bosch 13181 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management for select Volkswagen applications, including upstream service on Golf, Jetta, Cabriolet, Fox, Passat, and Corrado models.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Narrow-band heated O2 sensor for fast closed-loop response
• Specific fit design with threaded mounting
• 4-pin rectangle connector with 3-wire lead harness
• Metal housing with high-temperature-resistant construction
• 22 mm hex size and 18 mm thread diameter
• Wiring harness included for direct replacement service

Product Details

Bosch 13181 uses a switching-type sensing element to measure oxygen content in the exhaust stream and send accurate feedback to the engine control unit. Bosch developed this sensor family from its original OE oxygen sensor work, later refining planar narrowband designs for quicker light-off, improved lambda accuracy, and faster transition into closed-loop operation. For drivers searching for a Bosch 13181 oxygen sensor for Volkswagen Golf upstream or a Bosch 13181 oxygen sensor for Volkswagen Jetta upstream, this part matches the listed OE-style configuration and connector layout.

This part cross-references Bosch OE-style numbers 030906265AA and 030906265K for the same application.

What It Helps Address

• Fault codes related to oxygen sensor response or signal range
• Rough idle caused by inaccurate air-fuel ratio feedback
• Increased exhaust emissions from delayed closed-loop control
• Poor fuel control during warm-up and normal driving
• Driveability issues tied to a worn upstream narrow-band sensor

Installation Notes and Tips

Install Bosch 13181 in the upstream position only where listed in the fitment data. Verify the vehicle uses a 4-pin connector and 3-wire lead configuration before installation. The sensor threads into an 18 mm bung and uses a 22 mm hex for removal and tightening. Confirm the connector shape, terminal count, and harness routing against the original part before final assembly.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The sensor is built to OE-proven standards for accuracy, thermal durability, and consistent operation under vibration and heat.

Compatible Vehicles

• Fits 1993-1998 Volkswagen Golf, Upstream, with 4 Pin Connector; with 3 Wire Leads; Actual OE Oxygen Sensor
• Fits 1993-1995 Volkswagen Jetta, Upstream, with 4 Pin Connector; with 3 Wire Leads; Actual OE Oxygen Sensor
• Fits 1990-1993 Volkswagen Cabriolet, Upstream, without California Emission System; Actual OE Oxygen Sensor
• Fits 1991-1993 Volkswagen Fox, Upstream, without California Emission System; Actual OE Oxygen Sensor
• Fits 1991-1993 Volkswagen Passat, Upstream, Actual OE Oxygen Sensor
• Fits 1990 Volkswagen Corrado, Upstream, Actual OE Oxygen Sensor