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Denso 234-4621 Oxygen Sensor - Downstream, Downstream Rear or Upstream
| Brand | Denso 234-4621 |
|---|---|
| Position | Downstream Rear |
| Connector Gender | Female |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 20.28 |
| Product line | OE Style |
| Fits | Acura and Honda · 36 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support efficient engine performance and fuel economy.
Aluminum oxide trap layer. Protects the ceramic element from silicone and lead contamination.
Cross-references ACDelco 213-1482, ACDelco 213-3104 and BorgWarner OS991 for the same application. See all 47.
Denso 234-4621 Oxygen Sensor for OE-Style Replacement
Denso 234-4621 is a heated, specific-fit oxygen sensor built for direct replacement in select Acura and Honda applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on OE-style installations.
Key Features
- Heated oxygen sensor for faster operating readiness
- Specific fit design for direct replacement
- 4-wire configuration with female connector
- Threaded mounting type with 0.708 in. thread diameter
- 20.28 in. wiring harness length
- OE Style construction for select Acura NSX, CL, EL, TL, and Honda Accord, Civic, and Prelude applications
OE-Style Design and Application
As part of Denso’s OE Style line, this oxygen sensor is built and tested to OE-level standards for accurate fit and dependable operation. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent exhaust signal quality and long service life. This Denso 234-4621 oxygen sensor is a direct replacement for select Acura NSX, Acura TL, and Honda Accord applications, along with other listed Acura and Honda models.
This part cross-references Bosch 13071 and NTK 24042 for the same application.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel mixture readings
- Poor fuel economy caused by inaccurate exhaust feedback
- Rough idle or drivability issues tied to sensor response
- Emissions test failures linked to a worn upstream or downstream sensor
Installation Notes and Tips
Verify the sensor position before ordering, since this part is listed for upstream and downstream rear locations depending on vehicle application. Confirm connector style, thread diameter, and harness length against the original sensor before installation. For fitment, use the exact vehicle listing: Fits 2000-2005 Acura NSX, Downstream Rear; Fits 2001-2003 Acura CL, Downstream; Fits 2001-2003 Acura EL, Downstream; Fits 2000-2003 Acura TL, Downstream; Fits 2001-2003 Honda Civic, Downstream; Fits 1998-2002 Honda Accord, Downstream; Fits 1997-2001 Honda Prelude, Upstream; Fits 1999 Acura TL, Downstream; Fits 1998-1999 Honda Accord, Downstream; Fits 1990-1993 Honda Accord, Upstream.
Quality Assurance
Denso manufactures and tests this oxygen sensor to strict OE standards for precise replacement fit and consistent performance. The OE-style design and contamination-resistant trap layer reflect Denso’s focus on accurate sensor output and durability in real-world exhaust conditions.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2005 | Acura | NSX | — | Downstream Rear | OE Style |
| 2004 | Acura | NSX | — | Downstream Rear | OE Style |
| 2003 | Acura | CL | — | Downstream | OE Style |
| 2003 | Acura | EL | — | Downstream | OE Style |
| 2003 | Acura | NSX | — | Downstream Rear | OE Style |
| 2003 | Acura | TL | — | Downstream | OE Style |
| 2003 | Honda | Civic | — | Downstream | OE Style |
| 2002 | Acura | CL | — | Downstream | OE Style |
| 2002 | Acura | EL | — | Downstream | OE Style |
| 2002 | Acura | NSX | — | Downstream Rear | OE Style |
| 2002 | Acura | TL | — | Downstream | OE Style |
| 2002 | Honda | Accord | — | Downstream | OE Style |
| 2002 | Honda | Civic | — | Downstream | OE Style |
| 2001 | Acura | CL | — | Downstream | OE Style |
| 2001 | Acura | EL | — | Downstream | OE Style |
| 2001 | Acura | NSX | — | Downstream Rear | OE Style |
| 2001 | Acura | TL | — | Downstream | OE Style |
| 2001 | Honda | Accord | — | Downstream | OE Style |
| 2001 | Honda | Civic | — | Downstream | OE Style |
| 2001 | Honda | Prelude | Type SH | Upstream | OE Style |
| 2000 | Acura | NSX | — | Downstream Rear | OE Style |
| 2000 | Acura | TL | — | Downstream | OE Style |
| 2000 | Honda | Accord | — | Downstream | OE Style |
| 2000 | Honda | Prelude | Type SH | Upstream | OE Style |
| 1999 | Acura | TL | — | Downstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 1999 | Honda | Accord | — | Downstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 1999 | Honda | Accord | — | Downstream | OE Style |
| 1999 | Honda | Prelude | Type SH | Upstream | OE Style |
| 1998 | Honda | Accord | — | Downstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 1998 | Honda | Accord | — | Downstream | OE Style |
| 1998 | Honda | Prelude | Type SH | Upstream | OE Style |
| 1997 | Honda | Prelude | Type SH | Upstream | OE Style |
| 1993 | Honda | Accord | — | Upstream | Female Connector; OE Style |
| 1992 | Honda | Accord | — | Upstream | Female Connector; OE Style |
| 1991 | Honda | Accord | — | Upstream | Female Connector; OE Style |
| 1990 | Honda | Accord | — | Upstream | Female Connector; OE Style |
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