/live/media/O2/O2_35034656_Fro.jpg)
OE Quality
60-Day Returns
/live/media/O2/O2_35034656_Fro.jpg)
/live/media/O2/O2_35034656_Ac2.jpg)
/live/media/O2/O2_35034656_Ac3.jpg)
/live/media/O2/O2_35034656_Ac4.jpg)
WalkerPart #: 350-34656
Walker 350-34656 Oxygen Sensor - Downstream
⚙️ 20 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$91.20Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦OE Replacement, Downstream
🚗Fitment: Audi, A4, A4 allroad, A4 Quattro, A5, A5 Quattro, A5 Sportback, Q5, and Q7
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Oxygen Sensor options
Walker 350-34656 Oxygen Sensor - Downstream
| Brand | Walker |
| Part Number | 350-34656 |
| Position | OE Replacement, Downstream |
| Heated | Yes |
| Wiring Harness Length | 525 |
| Wire Gauge Measurement | 20 |
| Sensor Type | Narrow-band |
| Terminal Type | Blade |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Connector Shape | Rectangular |
| Terminal Quantity | 4 |
| Connector Gender | Male |
| Terminal Gender | Male |
| Wrench Size | 22 |
| Thread Size | M18 - 1.5 |
| Overall Length | 550 |
| Mounting Type | Threaded |
This part fits 20 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2023 | Audi | A4 | 2.0L | L4 | Downstream | OE Replacement |
| 2022 | Audi | A4 | 2.0L | L4 | Downstream | OE Replacement |
| 2022 | Audi | A5 | 2.0L | L4 | Downstream | OE Replacement |
| 2021 | Audi | A4 | 2.0L | L4 | Downstream | OE Replacement |
| 2021 | Audi | A5 | 2.0L | L4 | Downstream | OE Replacement |
| 2020 | Audi | A4 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2020 | Audi | A4 allroad | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2020 | Audi | A4 Quattro | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2020 | Audi | A5 Quattro | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2020 | Audi | A5 Sportback | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2020 | Audi | Q7 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | A4 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | A4 allroad | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | A4 Quattro | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | A5 | 2.0L | L4 | Downstream | OE Replacement |
| 2019 | Audi | A5 Quattro | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | A5 Sportback | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | Q5 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2019 | Audi | Q7 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
| 2018 | Audi | Q5 | 2.0L | L4 | Downstream | B1S2; OE Replacement |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.