Bosch 0258017025 LSU 4.9 Wideband O2 Sensor

Vehicle Fitment

• Universal / Motorsport - wideband lambda applications (gasoline, diesel, E85)

Features

• Wideband LSU 4.9 sensor design for accurate AFR measurement
• Integrated heater for fast warm-up and stable readings
• Measures across a wide lambda range (lambda ≈ 0.65 to ∞)
• Robust planar ZrO2 dual-cell sensing element
• High-temperature tolerance: up to ~930°C continuous, ~1030°C short-term
• Standard M18 x 1.5 thread for easy installation
• 5-wire connector for accurate signal and heater control
• Long cable length (~1,000 mm) for flexible mounting

Specifications

• Part Number: 0258017025
• Sensor Type: LSU 4.9 wideband oxygen (Lambda) sensor
• Thread Size: M18 x 1.5
• Wrench Size: 22 mm
• Tightening Torque: 40-60 Nm
• Wire Length: ~1,000 mm
• Operating Temp (exhaust): up to ~930°C; short-term max ~1030°C
• Supply Voltage: 10.8-16.5 V
• Heater Power: ~7.5 W steady-state
• Nominal Nernst Cell Resistance: ~300 Ω

Included Components

• 1x Bosch LSU 4.9 Wideband Lambda Sensor (0258017025)

Product Description

The Bosch 0258017025 is a high-performance wideband oxygen (lambda) sensor designed for precise air-fuel ratio monitoring in motorsport and tuning applications. Its planar dual-cell design and integrated heater ensure rapid warm-up and consistent, accurate measurements across a broad lambda range.

Built to withstand harsh conditions, it can handle continuous exhaust temperatures up to ~930°C and short-term spikes up to ~1030°C. With an M18x1.5 threaded body and 5-wire connector, it is compatible with many wideband controllers, ECUs, and data-logging systems.

Ideal for performance builds, race engines, and any application requiring accurate AFR feedback. Users must ensure their controller supports LSU 4.9 sensors before installation.