Ignitions and Electrical› Ignition Components

NGK

NGK Audi A8 Quattro 2009-2005 Direct Fit Oxygen Sensor

$174.58

SKU: N003 25661

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The NGK 25661 is a direct-fit oxygen sensor designed for Audi A8 Quattro models from 2005-2009. As an NTK OE Type Oxygen Sensor, it is engineered by the world's largest supplier and manufacturer of OEM oxygen sensors. This sensor plays a crucial role in the vehicle's on-board diagnostic system by providing feedback to the ECU for optimal engine performance, fuel efficiency, and reduced emissions. It helps control the air-fuel ratio and alerts OBDII systems to potential issues with fuel delivery or catalytic converter efficiency.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandNGK
Part NumberN003 25661

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy