Bosch 17148 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17148 is an Actual OE Oxygen Sensor built for precise air-fuel ratio monitoring on select Audi, Volkswagen, and Porsche applications. This heated wideband sensor provides the ECU with detailed lambda data for accurate fuel control, stable drivability, and lower emissions.

Compatible With upstream applications on the Audi A3, Q5, Q7, A6 Quattro, A7 Quattro, A8 Quattro, R8, Volkswagen Golf, Jetta, Passat, Touareg, Beetle, and Porsche Cayenne. Bosch 17148 is a direct-fit, specific-fit replacement with a 5-wire harness, oblong male connector, and threaded mounting design.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor warm-up and stable operation
• Specific-fit replacement with included wiring harness
• 5-wire configuration with blade terminals and 6-terminal connector layout
• Threaded 18 mm sensor mount with 22 mm hex size
• Robust metal housing for OE-style durability
• Overall length: 29.9 in; sealing surface to connector end: 28.7 in

Product Details

Bosch 17148 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-proven sensor design and calibration for modern engine management systems. Bosch pioneered the wideband A/F oxygen sensor with a planar pump-cell design that became a standard for current low-emission engine control. This sensor is engineered to deliver fast light-off, controlled heater performance, and reliable readings during rapid load changes and thermal cycling. It cross-references Porsche 95860617221 and URO 1K0998262AD for the same application.

Common Issues This Sensor Can Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle or hesitation caused by inaccurate mixture feedback
• Reduced fuel economy from poor ECU fuel-trim control
• Elevated emissions from delayed or unstable sensor response

Installation Notes

Install as an upstream oxygen sensor on the listed Audi, Volkswagen, and Porsche applications. Verify connector shape, wire count, thread size, and harness length before installation. Use proper oxygen sensor service tools and follow the vehicle manufacturer’s torque and routing specifications to avoid harness damage or exhaust leaks.

Quality Assurance

Bosch supplies this sensor with OE development experience and wideband oxygen sensor engineering used across modern engine management systems. The Bosch 17148 is built to OE-style standards for accurate signal output and dependable operation in demanding exhaust conditions.