Bosch 13508 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13508

Bosch 13508 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a specific-fit replacement for select Audi applications, including 1992 Audi 100 and 100 Quattro and 1993 Audi 100 Quattro and 90 Quattro, with upstream placement coverage.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated design for stable closed-loop operation
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Specific-fit sensor with wiring harness included
• 3-wire configuration with round connector and 4 terminals
• Steel-finish metal housing for standard replacement use

Product Details

Built on Bosch’s long OE development history, this oxygen sensor uses advanced ceramic sensing elements, controlled heater operation, and high-temperature-resistant materials to maintain consistent signal output under heat and vibration. Bosch 13508 is engineered to deliver accurate exhaust feedback so the engine control system can manage combustion and emissions with the correct air-fuel balance. For drivers searching for a Bosch 13508 oxygen sensor for Audi 100 Quattro upstream or a Bosch 13508 replacement for Audi 90 Quattro, this part matches the listed OE-style application.

Bosch’s Actual OE Oxygen Sensor line focuses on direct replacement performance and OE-proven sensor behavior. This makes it a practical choice for restoring proper upstream oxygen sensor function on the Audi 100, Audi 100 Quattro, and Audi 90 Quattro listed below. This part cross-references 46641555 and 048906265 for the same application.

What It Helps Address

• Fault codes related to upstream oxygen sensor signal performance
• Rough idle caused by inaccurate air-fuel feedback
• Reduced fuel control precision during closed-loop operation
• Emissions test failures tied to a worn narrow-band sensor
• Delayed sensor response from heat-aged OE units

Installation Notes

Install in the upstream exhaust position only for the listed vehicles. Verify connector style, thread size, and harness routing before installation. The sensor uses a threaded mount and includes the wiring harness, so the existing exhaust bung and electrical connection should be inspected for corrosion, damage, or thread wear before fitting. For fitment-specific searches, this Bosch oxygen sensor 13508 is listed for 1992 Audi 100 upstream, 1992 Audi 100 Quattro upstream, 1993 Audi 100 Quattro upstream, and 1993 Audi 90 Quattro upstream.

Quality Assurance

Bosch supplies this sensor as part of its Actual OE Oxygen Sensor line, drawing on more than five decades of OE sensor development and aftermarket support. The design reflects Bosch’s focus on accurate signal output, durable construction, and consistent operation in demanding thermal conditions.