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BMW

Genuine BMW B58 Downstream Oxygen Sensor 540mm - Post-Cat Rear O2/Lambda Sensor | OEM 11788611294 | Fits M140i M240i 340i 440i 540i 640i 740i X3 M40i (F20 F21 F22 F23 F30 F31 F34 F32 F33 F36 G11 G12 G30 G31 G32 G01)

Genuine BMW B58 Downstream Oxygen Sensor 540mm - Post-Cat Rear O2/Lambda Sensor | OEM 11788611294 | Fits M140i M240i 340i 440i 540i 640i 740i X3 M40i (F20 F21 F22 F23 F30 F31 F34 F32 F33 F36 G11 G12 G30 G31 G32 G01)

£228.18
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

OE BMW B58 After Catalyst Emissions Sensor 540 mm Harness

Restore clean running, smooth idle and accurate fuelling on your turbocharged six with this original BMW catalyst monitoring sensor for the after‑cat position. This secondary lambda probe is the exact OE replacement for B58 applications and features the correct 540 mm lead and factory connector for a simple plug‑in swap.

Part number: 11788611294

Why enthusiasts choose this OE sensor

  • Genuine BMW component for precise mixture control and emissions compliance
  • Direct replacement with correct length loom and OEM plug
  • Helps resolve engine light faults linked to catalyst monitoring and mixture correction
  • Supports fuel economy, drivability and consistent closed‑loop operation
  • Proven reliability on B58 engines across F Series and G Series platforms

We install these weekly at MJ Modifications and customers consistently report fault‑free running and excellent durability once fitted.

Compatibility

Designed for B58 powered models in the after‑catalyst position:

1 Series

  • F20 LCI 09/2015 to 06/2019
    • M140i and M140ix
  • F21 LCI 09/2015 to 06/2019
    • M140i and M140ix

2 Series

  • F22 09/2015 to 06/2017
    • M240i and M240ix
  • F22 LCI 09/2016 to 12/2019
    • M240i and M240ix
  • F23 09/2015 to 06/2017
    • M240i and M240ix
  • F23 LCI 10/2016 to 12/2019
    • M240i and M240ix

3 Series

  • F30 LCI 10/2014 to 10/2018
    • 340i and 340ix
  • F31 LCI 10/2014 to 06/2019
    • 340i and 340ix
  • F34 GT LCI 09/2015 to 12/2019
    • 340i and 340ix

4 Series

  • F32 04/2015 to 02/2017
    • 440i and 440ix
  • F32 LCI 05/2016 to 12/2019
    • 440i and 440ix
  • F33 03/2015 to 02/2017
    • 440i and 440ix
  • F33 LCI 05/2016 to 12/2019
    • 440i and 440ix
  • F36 Gran Coupe 03/2015 to 02/2017
    • 440i and 440ix
  • F36 Gran Coupe LCI 05/2016 to 12/2019
    • 440i and 440ix

5 Series

  • G30 10/2015 to 06/2019
    • 540i and 540ix
  • G31 03/2016 to 06/2019
    • 540ix

6 Series

  • G32 GT 09/2016 to 06/2019
    • 640i and 640ix

7 Series

  • G11 10/2014 to 01/2019
    • 740i
  • G12 10/2014 to 02/2019
    • 740i, 740ix, 740Li and 740Lix

X Series

  • G01 X3 10/2016 to 07/2019
    • X3 M40ix

What you receive

  • 1 x OE BMW after‑catalyst emissions sensor with 540 mm lead

Installation

Straight swap using the original mounting and connector on B58 models listed. Prefer a professional fit and code clear? Book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

We will confirm fitment

Add your UK registration or the last 7 of your VIN at checkout and we will verify compatibility before dispatch.

Manufacturer

BMW

Warranty

Two years manufacturer warranty for UK customers and one year for international customers when a VIN is supplied at checkout on compatible vehicles.

Search phrases customers use

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