NTK Ultra O2 Sensors

Brand: NTK | Part #EXH-21CDF5

Category: Exhaust > O2 Sensors

The NTK Ultra O2 Sensors (P/N EXH-21CDF5) is a direct-fit O2 Sensors for the vehicles listed in the fitment section. Flange geometry, hanger locations, and pipe ID match the factory routing so it bolts up without fabrication. Sourced from NTK, a recognized supplier in the aftermarket auto parts channel. Part number EXH-21CDF5 is the manufacturer reference — match it against your old part or VIN-based lookup to confirm you have the right unit. Confirmed fitment on 2015–2017 Lincoln, Honda including Aviator, Navigator, Corsair, Civic Type R, Civic Si. Use the year/make/model selector above to verify your exact configuration before checkout. In-stock items leave the warehouse within one business day. Free shipping over $75; ground delivery is 3–7 business days nationwide. Backed by a 90-day return window — if the part doesn't fit or the wrong unit was shipped, send it back for a full refund.

Price: $397.99 | In stock — ships within 1-2 business days. Free shipping.