# Increase the number of oxygen sensors

**URL:** <https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960>\
**Category:** GENERAL\
**Created:** [June 30, 2025, 9:44am UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960 "2025-06-30T09:44:50Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ESPER](https://avatars.discourse-cdn.com/v4/letter/e/e9bcb4/32.png) [@ESPER](https://community.ecumaster.com/u/ESPER)\
**Post date:** [June 30, 2025, 9:44am UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960/1 "2025-06-30T09:44:50Z")

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Could you please assist me? I have already purchased EMUpro-16. Now I have two engines ready for calibration. One is a four-cylinder engine and the other is a six-cylinder engine. However, the ECU pins can only accommodate two oxygen sensors. To achieve more accurate calibration values, is there any way to connect oxygen sensors to all six cylinders so that I can monitor the air-fuel ratio of each cylinder?

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**Author:** ![Mikebau5](https://avatars.discourse-cdn.com/v4/letter/m/c5a1d2/32.png) [@Mikebau5](https://community.ecumaster.com/u/Mikebau5)\
**Post date:** [June 30, 2025, 11:46am UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960/2 "2025-06-30T11:46:14Z")

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With a Lambda to CAN module you can connect more sensors

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**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\
**Post date:** [June 30, 2025, 12:18pm UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960/3 "2025-06-30T12:18:49Z")

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Use [LambdaToCAN](https://www.ecumaster.com/products/lambda-to-can/) external controllers.  
You can use as many as you need.

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**Author:** ![ESPER](https://avatars.discourse-cdn.com/v4/letter/e/e9bcb4/32.png) [@ESPER](https://community.ecumaster.com/u/ESPER)\
**Post date:** [July 1, 2025, 3:43am UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960/4 "2025-07-01T03:43:08Z")

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Thank you for your response. However, CAN1X requires PC-based communication. Can I connect multiple LambdaToCAN external controllers via the CAN2 port? (In a parallel form), are additional settings required on the software side? Looking forward to your reply.

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**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [July 1, 2025, 4:36am UTC](https://community.ecumaster.com/t/increase-the-number-of-oxygen-sensors/3960/5 "2025-07-01T04:36:18Z")

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You can connect them via CAN 1, and I’d recommend that way since you’ll need to change the addresses the LambdaToCAN’s are sending on in order to have multiple working. Making that change is done with a USBtoCAN device and the Light Client software.  
Can 2 would work after they are setup.