BOSCH Lambda Sensor LSU 4.2 - 0 258 007 057 / 0 258 007 058

Key Features & Benefits – BOSCH LSU 4.2 wideband lambda sensor

The BOSCH LSU 4.2 wideband lambda sensor measures lambda from exhaust oxygen content, helping with mixture setup and verification. It is functionally suited to controllers and ECUs that support an LSU 4.2 sensor.

For identification and replacement, the key part numbers are 0 258 007 057 / 0 258 007 058 plus common cross references. The application examples below are useful orientation points, while final fit depends on thread, connector and controller-side support.

When is this useful?

When tuning with a programmable ECU or a wideband AFR system, the BOSCH LSU 4.2 wideband lambda sensor provides real lambda feedback to refine idle, cruise and load mixture settings.

Technical specs

• Compatibility examples (VAG):
  • 1.4 (75 HP) Golf IV
  • 1.8 Turbo engines
  • 2.0
  • 2.3 V5
  • 2.8 VR6
  • 3.0 (Audi)
  • 6.0 W12 (Phaeton)
• Compatibility examples (BMW/Mercedes-Benz):
  • BMW 735i / 735iL (E65)
  • BMW X5 (E53) 4.4i
  • Mercedes-Benz C-Class (T203 / W203 / C203) C180 Kompressor, C200 Kompressor
• Cross reference part numbers:
  • VW: 021-906-262-B
  • Innovate Motorsport: 3737
  • Bosch: 17014 / 0 258 007 057 / 0 258 007 058
• Operating temperature: 930°C
• Max temperature (short-term): <1030°C
• Max cable sleeve temperature: <250°C
• Weight: 120 g
• Thread: M18x1.5
• Wrench size: 22 mm
• Tightening torque: 40–60 Nm
• Cable length: 760 mm

Selection & installation tips

• Controller support: confirm your ECU/controller is configured for an LSU 4.2 sensor.
• Thread & access: match the bung thread (M18x1.5) and ensure tool access for a 22 mm hex.
• Cable routing: plan routing around the 760 mm cable length and keep the loom clear of hot components.
• Tightening: stay within the 40–60 Nm range and keep threads clean.
• Heat exposure: respect the <250°C cable sleeve limit when securing and routing the harness.

Before fitting, self-verify LSU 4.2 controller support, thread match, cable routing and heat exposure, then compare your setup to the listed specs above to ensure the sensor matches your application.