A-Premium O2 Oxygen Sensor — 4-Wire Heated Downstream Replacement for VW Audi Porsche, Single Unit

A-Premium O2 Oxygen Sensor is a direct-fit downstream heated, 4-wire threaded sensor engineered to restore accurate exhaust oxygen readings on compatible Volkswagen, Audi and select Porsche models.

This replacement oxygen sensor fits a broad range of Volkswagen and Audi vehicles (plus some Porsche applications) where a downstream or center sensor is required. It uses a heated design and a 4-wire connector to match factory electrical and mounting specifications, helping the engine control unit receive the oxygen content data it needs to adjust fuel trim and emissions-related calculations.

Which vehicles and positions does this sensor fit?

The A-Premium unit lists many model-specific fitments including downstream, downstream rear/center and center locations across VW, Audi and Porsche lineups. Fitment covers multiple model years and engine options—always verify compatibility with your VIN and the reference numbers provided.

• Downstream fitment for Audi A3/A4/A5/A6/Q3/Q5, TT RS, and many Volkswagen Jetta, Golf, Beetle, CC, Tiguan, Passat variants.
• Center and downstream rear fitments for select Passat, Beetle, Golf, GTI and Jetta applications with L4, L5 and V6 engines.
• Special listings for larger Audi/VW engines (V8 4.2L, V6 3.6L, V6 3.0L) and some Touareg/Porsche Cayenne match-ups.
• Cross-reference IDs: 250-24672, 25024672, 350-34223, 35034223—use these when confirming part interchangeability.

What are the technical specifications and connector details?

This sensor is a heated oxygen sensor with a 4-wire configuration and threaded mounting, built to plug into the original male connector on applicable vehicles. It ships in a protective box as a single sensor, ready for straightforward replacement.

• Wire quantity: 4 (heated element plus signal and ground circuits).
• Sensor type: Heated oxygen sensor for faster operation after cold starts.
• Mounting: Standard threaded boss matching factory exhaust ports.
• Connector gender: Male, designed to mate with factory harness receptacles.

How should I verify fitment and install this oxygen sensor?

Before ordering, match the sensor’s reference numbers and fitment notes to your vehicle’s VIN and engine code. Installation typically involves unbolting the old sensor from the exhaust pipe or manifold and threading in the new sensor, then connecting the harness—torque and anti-seize practices depend on the vehicle service manual.

• Confirm fit by checking model year, engine displacement (L4, L5, V6, V8) and sensor position requirements.
• Use an oxygen-sensor socket or appropriate tool; avoid damaging the wiring during removal.
• Follow torque specs and diagnostic checks (clear codes and drive cycle) after replacement.

Who is this for?

This A-Premium oxygen sensor is intended for DIY mechanics, professional technicians and fleet service shops replacing a downstream/center oxygen sensor on compatible Volkswagen, Audi and certain Porsche/Cayenne/Touareg models. If your vehicle’s OBD-II system reports an O2-related code, or you need a direct-fit heated downstream sensor with the listed reference numbers, this part provides an economical aftermarket option that mirrors factory connection and mounting types.