Bosch 17351 Oxygen Sensor - Upstream or Upstream Left

Bosch Wideband OE Oxygen Sensor

Bosch 17351 is an Actual OE Oxygen Sensor built for precise air-fuel ratio measurement in wideband applications. It delivers continuous feedback to the ECU for accurate mixture control, helping support fuel efficiency, engine response, and lower emissions on the vehicles listed below.

Compatible With select Audi A4, Audi TT, Volkswagen Jetta, and Volkswagen Passat applications, Bosch 17351 is a specific-fit, heated wideband sensor with a 5-wire harness and 6-terminal blade connection. It is also listed for Volkswagen Touareg, Golf City, Jetta City, Phaeton, Beetle, Golf, EuroVan, and Audi A8 Quattro fitments, including upstream and upstream-left positions where specified.

Key Features

• Wideband A/F oxygen sensor for continuous lambda-range measurement
• Heated design for faster sensor activity after startup
• Specific-fit replacement with included wiring harness
• 5-wire configuration with 6 blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Bosch Actual OE Oxygen Sensor line for OE-style replacement performance

Product Details

Bosch 17351 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-proven sensor design for modern engine management systems. This wideband sensor measures air-fuel ratio across the full operating range, giving the ECU more detailed input than a traditional switching sensor. That level of control supports stable combustion, accurate fuel delivery, and emissions management under changing load and temperature conditions. This part cross-references 1K0998262D and 06A906262BC for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Rough idle or inconsistent engine operation tied to mixture control
• Reduced fuel economy caused by inaccurate sensor feedback
• Emissions test failures linked to upstream sensor faults

Installation Notes

Install this sensor in the confirmed upstream position for the listed Audi and Volkswagen applications. Verify the connector shape, terminal count, thread size, and harness length before installation. Because this is a specific-fit sensor, match the vehicle application exactly and inspect the exhaust bung threads and wiring routing during replacement.

Quality Assurance

Bosch has more than five decades of OE development in oxygen sensor technology. The wideband design uses fast light-off, optimized heater control, and durable construction to maintain reliable signal quality through rapid load changes and thermal cycling. Bosch 17351 is engineered to OE-level specifications for the listed applications.