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2006 Audi A4 Upstream Oxygen Sensor
The upstream oxygen sensor measures the exhaust ahead of the catalytic converter so the computer can balance the air and fuel mixture.
Compare upstream oxygen sensor for your A4 in the appSigns it may need replacing
- A check-engine light
- Worse fuel economy or a rough idle
- A failed emissions test
At a glance
| Part | Upstream Oxygen Sensor Sensors & Modules › Oxygen Sensors |
|---|---|
| Typical life | Often 60,000 to 100,000 miles. |
| DIY difficulty | Intermediate An oxygen sensor socket helps; sensors often stick in the exhaust. |
Lifespans and difficulty are general. They vary with the engine, trim, driving and climate, and your owner's manual and a qualified mechanic should have the final say.
Before you buy
Check the code to find which sensor and bank are at fault. Upstream means before the catalytic converter.
Confirm the part fits your exact 2006 Audi A4 by checking your VIN, engine size and trim with the seller. The A4 was sold with different options across the 2006 model year, and a part that fits one build may not fit another.
Where to buy a 2006 Audi A4 upstream oxygen sensor
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