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OE Quality
60-Day Returns
DensoPart #: 234-4409
Denso 234-4409 Oxygen Sensor - Downstream or Downstream Left
6 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$191.20Free 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 Style, Downstream Left and Downstream
Fitment: Audi, A4, A4 Quattro, A6, and A6 Quattro
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? See all Oxygen Sensor options
Denso 234-4409 Oxygen Sensor - Downstream or Downstream Left
| Brand | Denso |
|---|---|
| Part Number | 234-4409 |
| Position | OE Style, Downstream Left and Downstream |
| Wiring Harness Length | 38.19 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Connector Gender | Male |
| Thread Diameter | 0.708 |
| Mounting Type | Threaded |
This part fits 6 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2011 | Audi | A6 | Downstream | Cylinder 4,5,6; OE Style |
| 2010 | Audi | A6 | Downstream | Cylinder 4,5,6; OE Style |
| 2009 | Audi | A6 Quattro | Downstream | Cylinder 4,5,6; OE Style |
| 2006 | Audi | A4 | Downstream Left | To Chassis #8E-6-035 000; OE Style |
| 2006 | Audi | A4 Quattro | Downstream Left | To Chassis #8E-6-035 000; OE Style |
| 2005 | Audi | A4 Quattro | Downstream Left | OE Style |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
13955
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.