Bosch 18013 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Downstream Applications

Bosch 18013 is a direct-fit, heated narrow-band oxygen sensor built for downstream exhaust monitoring. It provides the ECU with accurate air-fuel-ratio feedback to support stable combustion control and lower emissions in everyday driving.

Compatible With Toyota Corolla, Toyota Matrix, Pontiac Vibe, Lexus SC430, and Lexus LS430 downstream applications, this Bosch Engineered Oxygen Sensor line reflects Bosch’s long OE development history in oxygen sensing technology.

Key Features

• Direct-fit oxygen sensor for specific applications
• Heated narrow-band design for faster closed-loop operation
• 4-wire configuration with square female connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Wiring harness included for application-specific replacement
• Metal housing and high-temperature-resistant construction
• Bosch part number 18013

Detailed Description

Bosch 18013 is engineered as a standard replacement oxygen sensor for downstream exhaust positions. It uses a switching-type narrow-band sensing element to relay precise mixture information to the engine control unit, helping the system maintain proper fuel control after the catalytic converter. The heated design supports quicker sensor activity during warm-up and steady operation across changing exhaust temperatures.

This Bosch Engineered Oxygen Sensor is a direct-fit replacement for 2009-2014 Toyota Matrix, 2009-2013 Toyota Corolla, 2002-2010 Lexus SC430, 2009-2010 Pontiac Vibe, and 2001-2006 Lexus LS430 downstream applications. Bosch 18013 is built with a threaded mount, female connector, and application-specific harness length for a clean OE-style replacement.

This part cross-references Bosch 18013 for the same application.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback after the catalytic converter
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough fuel control caused by a worn narrow-band sensor

Installation Notes and Tips

Verify the downstream position, connector shape, wire count, and thread size before installation. This sensor uses an 18 mm thread diameter and a 22 mm hex, so the correct oxygen sensor socket or wrench is recommended. Confirm the vehicle’s build details, especially for Toyota Corolla applications noted as Japan built or except Japan built, to ensure the correct match.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development behind this design. The 18013 follows Bosch’s OE-focused engineering approach, using durable materials, optimized heater control, and sensor construction intended for consistent performance in demanding thermal and vibration conditions.