1 1

NGK

NTK OZA833-EE1 / NGK 93099 Exhaust O2 Oxygen Lambda Sensor 4-Wire Heated | Upstream/Downstream Pre/Post-Cat | Bank 1 Sensor 1 & Sensor 2 (B1S1/B1S2) | Direct Fit AFR/Lambda Probe OEM Replacement for BMW, MINI Cooper, Peugeot & Citroen 1.4/1.6 VTi 1.6 THP

NTK OZA833-EE1 / NGK 93099 Exhaust O2 Oxygen Lambda Sensor 4-Wire Heated | Upstream/Downstream Pre/Post-Cat | Bank 1 Sensor 1 & Sensor 2 (B1S1/B1S2) | Direct Fit AFR/Lambda Probe OEM Replacement for BMW, MINI Cooper, Peugeot & Citroen 1.4/1.6 VTi 1.6 THP

£64.81
£100.22 £64.81
Sale Sold out
Shipping calculated at checkout.

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.

NTK OZA833-EE1 | NGK 93099 | 4‑wire heated exhaust gas sensor for BMW, MINI, Peugeot, Citroën

Restore crisp throttle response, smoother idle and cleaner emissions with this OE‑style, plug‑in replacement exhaust oxygen probe. The NTK OZA833‑EE1 / NGK 93099 features a 4‑conductor heated element for rapid warm‑up and stable closed‑loop fueling, helping your ECU maintain the ideal air–fuel ratios for performance and economy. Suitable for use in the position before the catalyst or after the catalyst depending on model, it’s an exact‑fit sensor for many BMW, MINI, Peugeot and Citroën petrol applications, including popular 1.4 and 1.6 VTi plus 1.6 THP engines.

We use this exact part in our own workshop builds and supply it daily to enthusiasts. Feedback from our customers is consistently excellent on fitment, reliability and drivability improvements.

Why it’s a smart upgrade

  • Quick light‑off heater for fast closed‑loop control and stable AFR feedback.
  • OE‑style connector and correct lead length for a straight swap with no splicing.
  • Improves fuel economy, drivability and helps reduce tailpipe emissions.
  • Ideal as a front sensor before the cat or rear sensor after the cat, depending on your vehicle.
  • Perfect replacement for many BMW, MINI, Peugeot and Citroën petrol models running 1.4/1.6 VTi and 1.6 THP engines.

Key details

  • Type: Exhaust oxygen probe / air‑fuel feedback sensor / lambda probe
  • Heater: Integrated 4‑wire heated element
  • Cable length: 681 mm
  • Direct replacement: Plug‑and‑play, OE‑style fit
  • NTK reference: OZA833‑EE1
  • NGK part number: 93099

Fitment guidance

This sensor can serve as the front pre‑catalyst unit or the rear post‑catalyst unit depending on model. Common search terms include Bank 1 Sensor 1 and Bank 1 Sensor 2. If your car shows poor MPG, hesitant acceleration, rough idle or an engine light relating to an oxygen probe fault, replacing the tired sensor with this direct‑fit unit is a proven remedy.

Vehicle coverage examples

BMW petrol models such as 114i, 116i, 118i, 120i, 316i, 320i. MINI R55, R56, R57, R58, R59, R60, R61 including One, Cooper, Cooper S and JCW. Peugeot 2008, 207, 208, 3008, 308, 408, 5008, 508, RCZ. Citroën C3, C4, C5, DS3, DS4, DS5. For 1.4 VTi, 1.6 VTi and 1.6 THP petrol engines among others.

Fitting and support

Prefer professional installation? Book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Check it’s right for your car

To confirm position and compatibility, send us your UK registration or last 7 of VIN and we’ll verify fitment before dispatch: info@mjmodifications.co.uk.

Part numbers

  • NTK: OZA833‑EE1
  • NGK: 93099

Search terms to help you find the right part

exhaust oxygen probe, air fuel ratio sensor, AFR sensor, lambda probe replacement, heated 4 wire sensor, front sensor before catalyst, rear sensor after catalyst, Bank 1 Sensor 1 B1S1, Bank 1 Sensor 2 B1S2, BMW 114i 116i 118i 120i 316i 320i sensor, MINI One Cooper Cooper S JCW sensor, Peugeot VTi THP sensor, Citroën petrol emissions sensor, pre cat sensor, post cat sensor, plug in O2 replacement, direct fit O2 probe, 681mm lead oxygen sensor.

View full details