Bosch 13404 Oxygen Sensor - Downstream or Upstream

Bosch OE Oxygen Sensor for Kia

Bosch 13404 is a narrow-band heated oxygen sensor built for specific Kia applications, including 1998-2002 Kia Sportage and 1998-2001 Kia Sephia, plus 2000-2001 Kia Spectra coverage. It provides direct air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

As part of Bosch Actual OE Oxygen Sensor coverage, this sensor follows OE-style construction and signal behavior for drivers searching for a Bosch 13404 oxygen sensor replacement for Kia Sportage upstream or downstream locations, or a Bosch 13404 fitment for Kia Sephia and Spectra.

Key Features

• Specific-fit narrow-band heated oxygen sensor
• 4-wire design with blade terminals and rectangular connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Metal housing with high-temperature-resistant construction
• Wiring harness included for direct replacement use
• Overall length: 16.3 in; harness length: 12.6 in

OE-Style Sensor Performance

Bosch developed this Actual OE Oxygen Sensor line from decades of original equipment engineering, starting with early Bosch sensor designs and advancing to planar narrowband technology for faster light-off and quicker closed-loop operation. Bosch 13404 uses a heated narrow-band sensor element to deliver consistent switching behavior and accurate feedback under changing exhaust temperatures. For Kia Sportage, Kia Sephia, and Kia Spectra applications, that means dependable signal response for emissions control and fuel mixture correction.

This part cross-references Bosch-style OE numbers for the same application, including 0K08A18861B and 0K08B18861B.

What It Helps Address

• Check engine light related to oxygen sensor signal faults
• Rough idle or unstable air-fuel mixture control
• Failed emissions inspection tied to sensor performance
• Slow closed-loop response after warm-up
• Fuel trim issues caused by inaccurate exhaust feedback

Installation Notes

Verify the sensor position before ordering, since Bosch 13404 is listed for both upstream and downstream locations on select Kia Sportage models and upstream locations on Kia Sephia and Kia Spectra applications. Confirm connector shape, 4-wire configuration, and 18 mm thread size against the original sensor before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads and wiring routing during replacement.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development and aftermarket supply experience. The sensor uses ceramic elements, controlled heater operation, and heat-resistant materials to support consistent performance in demanding thermal and vibration conditions.