Bosch 17025 4.9 LSU pinout/wiring diagram?

s300 and SManager software questions & answers
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DrSatan
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Joined: Fri Nov 14, 2025 3:52 am

Bosch 17025 4.9 LSU pinout/wiring diagram?

Post by DrSatan »

I bought a Bosch 17025 which is the sensor from the AEM wideband kit, and I can't figure out the what wire is which. Seems like it should be simple but the instructions for wiring the sensor directly to the S300 ECU are in layman's terms like "positive wire," "negative wire," and "signal wire" while the only wiring diagrams I can find for the Bosch 17025 sensor is written with symbols that I dont understand. I just need to figure out which is positive, negative, and signal wire. I have 5 wires, yellow, red, black, white, and gray to choose from. Can anybody help me?

Thanks!
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Spunkster
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Re: Bosch 17025 4.9 LSU pinout/wiring diagram?

Post by Spunkster »

Do you have a wideband controller or are you trying to wire the sensor directly without a controller?
nonwo68
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Joined: Sat Feb 07, 2026 10:11 pm

Re: Bosch 17025 4.9 LSU pinout/wiring diagram?

Post by nonwo68 »

I'm in a similar situation, trying to install without a controller. Is a controller required?

@Spunkster
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Spunkster
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Re: Bosch 17025 4.9 LSU pinout/wiring diagram?

Post by Spunkster »

You must have a controller.
nonwo68
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Joined: Sat Feb 07, 2026 10:11 pm

Re: Bosch 17025 4.9 LSU pinout/wiring diagram?

Post by nonwo68 »

Spunkster wrote: Fri Feb 27, 2026 3:35 pm You must have a controller.
Thank you.
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