NGK Oxygen (O2) Lambda Sensor 97085 OZA830-EE1 - 4-Wire Heated - Fits BMW 1 Series E81/E87, 3 Series E90/E91, X3 E83, Z4 E85 (Upstream/Downstream)

NGK 97085 OZA830-EE1 Exhaust Gas Sensor for BMW Petrol Models

Restore crisp fuelling control and clean emissions with NGK part 97085, reference OZA830-EE1. This heated four-core exhaust gas probe delivers fast light-up and stable AFR feedback so your BMW runs smoothly, returns better mpg and is ready for MOT emissions testing when a tired sensor is the cause of issues. It is a direct-fit, plug-in replacement with the correct connector and lead length for the listed applications and positions.

At MJ Modifications we fit these sensors daily on our own builds and customer vehicles across Warwickshire. Reliability, signal accuracy and longevity have been excellent, and our customers consistently report smoother idle, sharper throttle response and cleared fault lights once the old probe is replaced where applicable. Genuine NGK quality you can trust.

Why this NGK unit is a smart upgrade

• Authentic NGK component for OE-level fit and function
• Heated narrowband design for rapid warm-up and stable closed-loop mixture control
• Correct plug and cable length for the specified BMW platforms
• Helps address poor fuel economy, rough running and emission-related fault codes when the original sensor has aged
• Suitable for pre-cat and post-cat locations as specified by the vehicle manufacturer

Technical details

Fitment and locations

For the BMW models below, this sensor covers before-catalyst and after-catalyst positions as applicable. If your dashboard shows an emissions warning, sluggish performance or high fuel use, replacing an ageing probe with this NGK unit is a proven remedy where correct for your engine and bank.

We verify compatibility before dispatch

Add your UK registration or the last 7 characters of your VIN at checkout. Our team will confirm the correct position and suitability of NGK 97085 OZA830-EE1 for your specific vehicle before we ship.

Professional fitting available

Prefer specialist installation. Book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quotation and availability. We can remove seized probes, clear codes and road test after installation.

Search-friendly terms

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Part numbers

• NGK Part Number: 97085
• NGK Reference: OZA830-EE1

Genuine NGK boxed part supplied by MJ Modifications. Performance-focused advice, fast dispatch and support from enthusiasts who fit these sensors every day.