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NGK

NGK 91224 / NTK UAR9000-EE063 Exhaust O2 Oxygen Lambda Probe AFR Sensor - Upstream/Downstream Pre/Post Cat (Front/Rear) B1S1 B1S2 - BMW 540i E60, 740i F01/F02, X6 35i E71/E72; Mercedes W204 C-Class, W212 E-Class, SLK R172 - OE/OEM Direct-Fit

NGK 91224 / NTK UAR9000-EE063 Exhaust O2 Oxygen Lambda Probe AFR Sensor - Upstream/Downstream Pre/Post Cat (Front/Rear) B1S1 B1S2 - BMW 540i E60, 740i F01/F02, X6 35i E71/E72; Mercedes W204 C-Class, W212 E-Class, SLK R172 - OE/OEM Direct-Fit

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Factory-Spec Lambda Probe NGK 91224 / NTK UAR9000-EE063 for BMW and Mercedes Applications

Get your mixture control back on point with this genuine NTK lambda probe by NGK. Built to original equipment standards, part numbers NGK 91224 and NTK UAR9000-EE063 deliver precise closed-loop feedback for smooth drivability, clean emissions and reliable fuel trims on the models listed below.

If you are chasing rough idle, hesitant acceleration, uneven fuel economy or an engine management light relating to mixture control, a fresh lambda probe is often the simplest fix. This exhaust gas sensor provides fast, accurate feedback to the ECU so your BMW or Mercedes can maintain optimum air fuel balance and pass emissions checks with confidence.

  • Genuine NTK by NGK for factory-level accuracy and long service life
  • Direct-fit lambda probe for the listed BMW and Mercedes-Benz platforms
  • Restores precise AFR control for better throttle response and MPG
  • Helps resolve mixture-related fault codes and MOT emissions issues
  • Durable build and stable output for consistent closed-loop performance

We run these sensors on our own projects and customer cars at MJ Modifications. Feedback has been excellent for fit, function and the immediate improvement once a tired probe is replaced.

Sensor position guidance

Many vehicles use multiple exhaust gas sensors. Confirm whether you need the unit before the catalyst (pre-cat, upstream, B1S1 or B2S1) or after the catalyst (post-cat, downstream, B1S2 or B2S2), and the correct bank for V engines. Unsure which you need? Contact us and we will verify the location for your car before you order.

Vehicle coverage

Use the selector to double-check fitment for your registration or VIN.

  • 5 Series
    • 540i
      • E60 3.0 (225 KW / 306 HP) (2006-2009)
  • 7 Series
    • 740i
      • F01/F02 3.0 (240 KW / 326 HP) (2008-2015)
  • X Series
    • X6 35i xDrive
      • E71/E72 3.0 (225 KW / 306 HP) (2007-2014)
      • E71/E72 3.0 (240 KW / 326 HP) (2007-2010)
  • C-Class
    • C-Class Saloon (W204)
      • C 180 CGI 1.8 (204.049) (115 KW / 156 HP) (01/2007 - 01/2014)
      • C 200 1.8 (137 KW / 186 HP) (05/2011 - 01/2014)
      • C 200 CGI 1.8 (204.048) (135 KW / 184 HP) (01/2007 - 01/2014)
      • C 250 CGI 1.8 (204.047) (150 KW / 204 HP) (07/2009 - 01/2014)
    • C-Class T-modell (S204)
      • C 180 CGI 1.8 (204.249) (115 KW / 156 HP) (11/2009 - 08/2014)
      • C 200 CGI 1.8 (204.248) (135 KW / 184 HP) (08/2007 - 08/2014)
      • C 250 CGI 1.8 (204.247) (150 KW / 204 HP) (07/2009 - 08/2014)
    • C-Class Coupe (C204)
      • C 180 1.8 (204.349) (115 KW / 156 HP) (06/2011+)
      • C 200 CGI 1.8 (204.348) (135 KW / 184 HP) (06/2011+)
      • C 250 1.8 (204.347) (150 KW / 204 HP) (06/2011+)
  • E-Class
    • E-Class Saloon (W212)
      • E 200 CGI 1.8 (212.048, 212.148) (135 KW / 184 HP) (08/2009 - 12/2015)
      • E 250 CGI 1.8 (212.047, 212.147) (150 KW / 204 HP) (01/2009 - 12/2015)
    • E-Class Coupe (C207)
      • E 200 CGI 1.8 (207.348) (135 KW / 184 HP) (01/2010 - 12/2016)
      • E 250 CGI 1.8 (207.347) (150 KW / 204 HP) (01/2009 - 12/2016)
    • E-Class T-modell (S212)
      • E 200 CGI 1.8 (212.248) (135 KW / 184 HP) (11/2009 - 12/2016)
      • E 250 CGI 1.8 (212.247) (150 KW / 204 HP) (11/2009 - 12/2013)
    • E-Class Convertible (A207)
      • E 200 CGI 1.8 (207.448) (135 KW / 184 HP) (01/2010 - 12/2016)
      • E 250 CGI 1.8 (207.447) (150 KW / 204 HP) (01/2010 - 12/2016)
  • SLK
    • SLK (R172)
      • 200 1.8 (172.448) (135 KW / 184 HP) (02/2011+)
      • 250 1.8 (172.447) (150 KW / 204 HP) (02/2011+)

Part numbers

  • NGK 91224
  • NTK UAR9000-EE063

Professional installation and support

Want it fitted correctly the first time? Book installation with MJ Modifications in Warwickshire. We can supply, fit and code where required. Request a quote at info@mjmodifications.co.uk.

Fitment check before dispatch

We are happy to verify compatibility. Add your UK registration or the last 7 of your VIN at checkout or email info@mjmodifications.co.uk and we will confirm the correct sensor position for your vehicle.

Helpful search phrases

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