NTK by NGK O2/Lambda Oxygen Sensor NGK 0486 (NTK OTA7H-5A1), Heated 4-wire Upstream/Downstream Pre-cat/Post-cat - BMW E36 320i 323i 328i, E39 520i 523i 528i, E38 728i - Direct Fit Replacement AFR/Mixture Probe

NTK by NGK Exhaust AFR Probe NGK 0486, NTK OTA7H-5A1

Bring back crisp throttle response, stable idle and sensible fuel use with this OE-equivalent heated exhaust oxygen probe from NTK by NGK. Part numbers NGK 0486 and NTK OTA7H-5A1. This 4‑wire, heated unit provides accurate air fuel feedback so your BMW’s management system can keep trims on point and emissions clean.

We fit these on our own builds and customer cars and they simply work. Fast light-off, dependable closed-loop control and consistent results. Owners report improved drivability, fewer warning lights and easier MOT emissions readiness after replacing a tired sensor.

Why this sensor is a smart choice

• Genuine NTK by NGK quality for reliable AFR feedback and fuel trim correction
• 4‑wire heated design, quick warm-up for stable closed-loop operation
• Helps resolve rich or lean running, rough idle and poor MPG caused by ageing probes
• Ideal as an upstream or downstream replacement, pre‑cat or post‑cat depending on application
• Plug-and-play fitment on the BMW models listed, no cutting or splicing required

Search-friendly phrases our customers use

BMW exhaust oxygen probe, AFR sensor for BMW, heated 4 wire O2 probe, pre cat sensor replacement, post cat emissions sensor, upstream oxygen probe, downstream O2, bank 1 sensor 1, bank 1 sensor 2, BMW E36 320i O2 replacement, BMW 323i AFR probe, BMW 328i post cat sensor, BMW E39 520i oxygen probe, BMW 523i lambda replacement, BMW 528i O2 sensor UK, BMW 728i emissions sensor, NGK 0486 sensor, NTK OTA7H-5A1.

Part numbers and key details

• Brand: NTK by NGK
• NGK Part Number: 0486
• NTK Reference: OTA7H-5A1
• Circuits: 4
• Overall lead length: 968 mm

Position can be pre‑catalyst or post‑catalyst depending on the vehicle variant. Always confirm the correct location for your car.

Compatible BMW applications

This probe is used across popular BMW petrol six-cylinder models listed below. Check your exact variant before ordering.

• E36 3 Series
  • 320i, 323i, 328i across Saloon, Coupe, Touring and Convertible
  • 3 Compact 323Ti
• E39 5 Series
  • 520i, 523i, 528i in Saloon and Touring
• E38 7 Series
  • 728i, 728iL

Typical years covered include mid‑1990s through early 2000s for the models above. If unsure, ask us to verify using your registration or last 7 of VIN.

Symptoms that point to a failing probe

• Increased fuel consumption or fuel smell from exhaust
• Hunting idle, hesitation or flat spots
• Emissions warnings and readiness monitors not completing
• OBD fault codes such as P0130, P0133, P0135, P0140, P0141 related to O2 sensing or heater circuit

Order with confidence

We offer a free compatibility check before dispatch. Enter your registration number for UK cars or the last 7 of your VIN at checkout and we will confirm this NGK 0486, NTK OTA7H-5A1 sensor is correct for your specific vehicle and whether you need an upstream or downstream position.

Professional fitting

For installation, we recommend booking with MJ Modifications in Warwickshire. We handle seized sensors and thread care correctly for a trouble-free install. Request a quote at info@mjmodifications.co.uk.

In short

Need a BMW exhaust oxygen probe that restores smooth running and clean emissions without guesswork? Choose NTK by NGK NGK 0486, NTK OTA7H-5A1. Trusted performance, OE-grade build and proven results on the BMW models listed. UK enthusiast support from MJ Modifications.