NGK NTK O2 Oxygen Lambda Probe 4‑Wire Heated 910mm – NGK 0273 / NTK OZA572‑E12/OZA572E12 – Direct Fit AFR Exhaust Gas Sensor for BMW E30 E34 316i 318i 518i (Upstream/Downstream, Pre/Post‑Cat)

NGK 0273 NTK OZA572-E12 4-wire Heated AFR Probe - 910 mm Lead

Bring back sharp drivability, smoother idle and cleaner emissions with this genuine NGK-NTK exhaust oxygen probe. Engineered to OEM standards, this 4-wire heated AFR sensor delivers rapid light-up and precise mixture control, helping your classic BMW run as it should. Part numbers: NGK 0273, NTK OZA572-E12.

We fit these on our own builds and customer cars with consistently excellent results. If you are chasing poor MPG, a warning light, lumpy idle, hesitation or MOT emissions issues, refreshing the exhaust gas sensor is often the quickest win for reliability and performance.

Why enthusiasts choose this sensor

• True OE-grade NGK-NTK component for factory-level accuracy and durability
• Direct plug-in for the BMW fitments listed below - no cutting or splicing required
• Heated 4-wire design for fast closed-loop operation and stable AFR control
• Improves throttle response, fuel economy and emissions performance
• Ideal as a pre-cat or post-cat replacement where applicable to the vehicles listed

Key details

• NGK part number: 0273
• NTK reference: OZA572-E12
• Circuits: 4
• Cable length: 910 mm

Vehicle suitability - BMW

Please verify compatibility before ordering. Supported applications include:

• BMW 3 Series
  • E30 Saloon
    • 316i 1.6 75 kW 102 hp 07/1988 - 06/1991
    • 318i 1.8 83 kW 113 hp 09/1987 - 06/1991
    • 318i 1.8 85 kW 115 hp 09/1987 - 06/1991
  • E30 Touring
    • 316i 1.6 75 kW 102 hp 09/1991 - 06/1994
    • 318i 1.8 83 kW 113 hp 04/1989 - 06/1994
    • 318i 1.8 85 kW 115 hp 09/1987 - 06/1991
  • E30 Convertible
    • 318i 1.8 83 kW 113 hp 09/1990 - 10/1993
• BMW 5 Series
  • E34 Touring
    • 518i 1.8 83 kW 113 hp 03/1993 - 09/1994
    • 518i 1.8 85 kW 115 hp 09/1994 - 01/1997
  • E34 Saloon
    • 518i 1.8 83 kW 113 hp 08/1989 - 09/1995
    • 518i 1.8 85 kW 115 hp 08/1989 - 09/1995

How this upgrade helps

• Restores accurate air-fuel feedback for crisp response
• Helps cure rich or lean running and sulphurous smells
• Reduces fuel consumption and soot build-up
• Supports passing emissions testing when used with a healthy engine and catalyst

Fitment confirmation

We will confirm suitability before dispatch. At checkout, include your UK registration or last 7 digits of the VIN and we will verify the correct probe for your vehicle.

Professional installation

Want it fitted correctly first time? Book installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

What our customers say

Used across our own fleet and customer cars, this NGK-NTK unit has delivered reliable results, fast warm-up and stable fuelling. Owners report smoother running, fewer fault codes and improved drivability.

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