Bosch 13842 Oxygen Sensor - Downstream or Upstream

Bosch Actual OE Oxygen Sensor 13842

Bosch 13842 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a direct replacement for select Audi and Volkswagen applications, including Audi A4, A4 Quattro, A6, A6 Quattro, A8, A8 Quattro, and Volkswagen EuroVan and Passat models.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Narrow-band heated design for faster closed-loop operation
• Blade terminals, oblong connector, and 4-wire harness configuration
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included for a direct replacement layout
• Part number 13842 for easy identification and ordering

Product Details

As part of Bosch’s Actual OE Oxygen Sensor line, Bosch 13842 reflects the company’s long OE development history in switching-type O2 sensing. Bosch uses ceramic sensing elements and controlled heater operation to deliver stable signal response, accurate lambda feedback, and consistent performance under heat and vibration. This makes it a practical OE-style replacement for emissions and drivability service on Audi A4 and Volkswagen Passat applications, as well as other listed fitments.

This part cross-references 021906265AK for the same application.

What It Helps Address

• Check engine lights related to oxygen sensor performance
• Rich or lean fuel trim conditions caused by inaccurate O2 feedback
• Slow closed-loop response after cold start
• Unstable idle or drivability issues tied to exhaust sensor signal quality
• Failed emissions inspection caused by a worn upstream or downstream sensor

Installation Notes

Verify the sensor position before ordering, since this part is listed for both upstream and downstream locations depending on vehicle application. Confirm connector shape, wire count, thread size, and harness length against the original sensor before installation. Use proper oxygen sensor service tools to avoid damaging the threaded bung or sensor body during removal and tightening.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement backed by more than five decades of oxygen-sensor development. The design uses durable materials and heater control strategies intended to maintain accurate operation across a wide range of exhaust temperatures and operating conditions.