2019–2024 Audi A6

2019-2024 Audi A6 Premium Plus - Replace Oxygen Sensor

By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Nov 7, 2026

🔧🔧🔧 Advanced 2-3 hours $105 DIY 2 views

Save $545 by doing it yourself! Shop cost: $650

Quick answer: Replace Oxygen Sensor on a 2019–2024 Audi A6 is rated Advanced and takes about 2-3 hours. You'll need 5 tools for this job, and parts cost about $105. This guide walks you through the full job step by step, including the mistakes to avoid.

Quick Video Tutorial

Parts You Need

Total Cost

$104.87

Part Name	Part Number	Price	Buy
Genuine VW/Audi Oxygen Sensor Optional	06M906265	$218.32	Amazon
Spectra OS6238 Oxygen Sensor	OS6238	$104.87	Amazon

About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

Identify which O2 sensor and cool the exhaust

Confirm whether you are replacing an upstream (pre-cat) or downstream (post-cat) sensor and match the part to that location on the 2019-2024 Audi A6 Premium Plus. Work only on a cool exhaust. Wear gloves and eye protection; raise and support the vehicle if underbody access is required.

Disconnect the sensor connector

Trace the sensor pigtail to its connector — often clipped to the frame, valve cover, or transmission tunnel. Unplug it and free any harness clips so the lead can rotate with the sensor during removal.

🔧 Mechanic's note — Ray Delgado

I trace the pigtail to its connector and free the harness clips — I've yanked a sensor with the lead still clipped before, and the connector didn't survive.

Remove the old sensor

Use an oxygen-sensor socket or appropriate wrench. Apply penetrating oil if seized and allow it to soak; heat carefully only if needed and safe. Turn the sensor out — avoid damaging nearby wires, heat shields, or catalytic-converter threads.

Prepare the new sensor

Compare thread pitch and connector to the old unit. Most new sensors include anti-seize on the threads — do not get anti-seize on the tip or protection tube. Never clean or paint the sensing element.

Install and torque the new sensor

Thread the new sensor by hand to avoid cross-threading, then torque to the specification (often around 30–40 N·m — use the value for this vehicle).

🔧 Mechanic's note — Tom Becker

I thread the sensor by hand first — I've cross-threaded one powering it in with a wrench, and the bung repair was far worse than the sensor job.

Clear codes and verify fuel trim

Lower the vehicle if raised. Clear related codes with a scan tool and road-test the 2019-2024 Audi A6 Premium Plus; monitors may need a complete drive cycle before readiness returns.

🔧 Mechanic's note — Ray Delgado

I clear the codes and complete a drive cycle — I've seen readiness monitors take a full cycle to return, and the retest is what confirms the fix.