Bosch Oxygen Sensor LSU 4.9 (17025) - 0258017025

The Bosch Oxygen Sensor LSU 4.9 (17025) — part number 0258017025 — is a wideband oxygen sensor built around Bosch's LSU 4.9 sensing element, the same wideband technology widely used in motorsport and performance air/fuel ratio (AFR) monitoring systems. It's designed to work with a compatible wideband controller rather than as a stand-alone OE-style replacement sensor, making it a go-to choice for tuners, engine builders, and data-logging setups that need accurate, real-time air/fuel measurement.

Key Features & Benefits

• Advanced wideband sensing element – delivers precise air/fuel ratio readings across a broad range, giving tuners the accuracy needed for real-time AFR monitoring and closed-loop tuning.
• Robust sensor construction – built to Bosch's sensor engineering standards to help improve sensor longevity in demanding performance and data-logging applications.
• Controller compatibility – designed to pair with LSU 4.9-compatible wideband controllers, including systems used in Bosch Motorsports ECUs and popular aftermarket AFR gauge/controller platforms.
• Genuine Bosch part – carries the Bosch part number 17025 / 0258017025, the same designation referenced by wideband controller manufacturers when specifying a compatible replacement sensor.

Specifications

• Brand: Bosch
• Part Number / MPN: 0258017025
• Bosch Sensor Number: 17025
• Sensor Type: LSU 4.9 Wideband Oxygen (O2) Sensor
• Sold individually

Fitment

This is a universal wideband oxygen sensor, not a direct vehicle-specific OE replacement. It is intended for use with LSU 4.9-compatible wideband controllers — such as those used in Bosch Motorsports ECU systems and comparable aftermarket AFR controller/gauge setups — rather than plugging directly into a factory ECU without a controller. Always confirm your controller or ECU calls for an LSU 4.9-type sensor before ordering.

Why Buy from ThreePiece.us

ThreePiece.us backs every order with knowledgeable fitment and compatibility support, so you can confirm this Bosch LSU 4.9 sensor will work with your specific wideband controller or ECU before you buy. Every order ships free, and you can split the cost with Affirm financing at checkout — helpful when you're building out a full AFR monitoring or tuning setup.

Frequently Asked Questions

Does this sensor work as a plug-and-play OE oxygen sensor replacement?
No. The LSU 4.9 element requires a compatible wideband controller to interpret its signal — it is not a direct factory-style narrowband sensor swap.

What controllers is this sensor compatible with?
It's designed to work with LSU 4.9-compatible wideband controllers, including those used in Bosch Motorsports ECUs and comparable aftermarket wideband AFR controller/gauge systems. Confirm your specific controller supports the LSU 4.9 element before ordering.

Is this the genuine Bosch 17025 / 0258017025 sensor?
Yes, this listing is for the Bosch LSU 4.9 sensor identified by Bosch part number 17025, also referenced under manufacturer part number 0258017025.

How many sensors come in an order?
This part is sold individually, one sensor per order.