Bosch 13422 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Toyota and Lexus

Bosch 13422 is a specific-fit, narrow-band heated oxygen sensor built for upstream applications on select Toyota and Lexus vehicles. It delivers air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate combustion management, and lower emissions.

Part number 13422 is part of the Bosch Engineered Oxygen Sensor line, which builds on Bosch OE development in oxygen sensing technology. This sensor uses a ceramic sensing element, optimized heater control, and high-temperature-resistant materials for consistent signal response under heat and vibration.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for upstream air-fuel feedback
• 4-wire configuration with rectangular male connector
• Blade terminals, 4 terminal count, and included wiring harness
• Flange mounting style with 18 mm thread size and 22 mm hex
• Standard replacement grade for emission control service
• Steel finish with metal housing for durability in harsh conditions

Detailed Description

Bosch 13422 is engineered for upstream oxygen sensor locations on 1990-1997 Toyota and Lexus applications, including Toyota Celica, Toyota MR2, Toyota Land Cruiser, and Lexus LX450. It measures exhaust oxygen content and sends the signal needed for precise fuel control, helping the engine maintain proper combustion across changing load and temperature conditions. This part cross-references 8946529365 and 8946569085 for the same application.

As part of the Bosch Engineered Oxygen Sensor line, this unit reflects Bosch’s long OE development history in oxygen sensing. The narrow-band heated design supports quicker closed-loop operation after startup, while the sensor’s materials and heater strategy are built to handle demanding thermal cycling in everyday driving.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings at the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to upstream sensor faults
• Rough idle or drivability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

Verify the upstream position, connector style, wire count, and thread size before installation. This Bosch 13422 oxygen sensor is a direct-fit replacement for the listed Toyota and Lexus applications, including 1996-1997 Toyota Land Cruiser, 1996-1997 Lexus LX450, 1995 Toyota Land Cruiser from 01/1995, 1991-1995 Toyota MR2, and 1990-1993 Toyota Celica. Confirm the exhaust bung and harness routing match the original sensor before final tightening.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emission control sensing. The Bosch Engineered Oxygen Sensor line is built to OE-level standards for signal accuracy, heater performance, and durability in demanding operating conditions.