Bosch 17270 Oxygen Sensor - Downstream or Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17270 is an Actual OE Oxygen Sensor built as a wideband air/fuel sensor for precise mixture feedback to the ECU. It is a specific-fit, heated sensor with a 5-wire harness and 6 terminals, made for direct replacement on select Volkswagen, Audi, Kia, and Hyundai applications.

For drivers searching for a Bosch oxygen sensor for Volkswagen CC, Audi A3, or Kia Forte fitment, this part number 17270 delivers OE-style signal accuracy and the connector, thread, and harness details needed for the listed applications.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement across the lambda range
• Heated design for faster sensor activity and stable operation
• Specific-fit replacement with included wiring harness
• Oblong male connector with blade terminals
• 18 mm thread diameter and 22 mm hex size
• Metal housing with threaded mounting type
• Overall length: 23.6 in; sealing surface to connector end: 22.4 in
• Bosch part number 17270

Product Details

Bosch pioneered the wideband A/F oxygen sensor design used in modern engine management, and this Actual OE Oxygen Sensor follows that OE development path. The wideband sensor provides detailed feedback to the engine control unit, helping maintain accurate fuel control under changing load and temperature conditions. Bosch 17270 is built with robust ceramic construction, optimized heater control, and fast light-off characteristics for dependable operation in demanding exhaust environments.

This Bosch oxygen sensor is used in select upstream and downstream positions across 2006-2017 Volkswagen, Audi, Kia, and Hyundai vehicles. It cross-references 06J906262AA and 392102E200 for the same application.

Common Issues This Sensor Can Address

• Fault codes related to oxygen sensor response or signal range
• Rough idle or inconsistent air-fuel control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Emissions test failures tied to sensor performance
• Delayed closed-loop operation after startup

Installation Notes

Verify the connector shape, wire count, thread size, and sensor position before installation. This part is a specific-fit Bosch oxygen sensor with a 20.3 in wiring harness length and 18 mm thread diameter, so matching the original sensor configuration is important. Use the listed vehicle position exactly as shown, including upstream or downstream placement and any emission-system notes.

Compatible applications include 2009-2017 Volkswagen CC, 2006-2014 Volkswagen GTI, 2006-2013 Audi A3, 2012-2016 Kia Soul, and 2011-2014 Hyundai Elantra without California Emission System. Additional fitments include Audi TT Quattro, Audi TTS Quattro, Volkswagen Jetta, Volkswagen Passat, Volkswagen Passat CC, Volkswagen Eos, Volkswagen Golf R, Kia Forte, Kia Forte Koup, Kia Forte5, and Audi TT.

Quality Assurance

Bosch supplies OE-proven oxygen sensors backed by more than five decades of original equipment development. Bosch 17270 is engineered to meet the demands of modern emission control systems with the same design approach trusted by vehicle manufacturers.