Denso 234-4752 Oxygen Sensor - Downstream or Downstream Left
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4752 Oxygen Sensor - Downstream or Downstream Left

Brand Denso 234-4752
Position Downstream
Connector Gender Female
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 25.59
Product line OE Style
Fits Mazda · 13 vehicles

OE style replacement. Precision-built for exact replacement and a first-time fit.

Heated sensor. Helps support quicker operation and efficient engine performance.

Threaded design. Female connector and specific fit for straightforward installation.

Cross-references ACDelco 213-3079, BorgWarner OS1836 and BorgWarner OS1919 for the same application. See all 23.

$73.38Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $73.38
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Oxygen Sensor options

Denso OE Style Oxygen Sensor 234-4752

Denso 234-4752 is an OE Style heated oxygen sensor built for specific-fit replacement on select Mazda applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on the vehicles listed below.

Key Features

  • Heated oxygen sensor with a specific-fit design
  • 4-wire configuration with female connector
  • Threaded mounting type for direct replacement
  • 25.59 in. wiring harness length
  • 0.708 in. thread diameter
  • OE Style construction for Mazda 6, Protege, Protege5, and MPV applications

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and electrical requirements for direct replacement service. 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 part cross-references Bosch 13688 and NTK 22514 for the same application. The Denso 234-4752 is a direct-fit choice for drivers servicing downstream oxygen sensor faults on Mazda 6, Mazda Protege, Mazda Protege5, and Mazda MPV models.

What It Helps Address

  • Check engine light related to downstream oxygen sensor performance
  • Incorrect air-fuel feedback from a worn sensor
  • Reduced fuel economy caused by inaccurate exhaust readings
  • Rough idle or drivability issues tied to sensor degradation
  • Emissions test failures caused by a faulty oxygen sensor

Installation Notes

Fits 2006-2008 Mazda 6, Downstream, Loc. After Primary Catalyst; Calif.; OE Style. Fits 2005 Mazda 6, Downstream, Loc. After Secondary Catalyst; Calif.; OE Style. Fits 1999-2003 Mazda Protege, Downstream, OE Style. Fits 2002-2003 Mazda Protege5, Downstream, OE Style. Fits 2000-2001 Mazda MPV, Downstream Left, California exempt parts can be used on pollution controlled vehicles in California.; OE Style. Verify connector style, thread size, and sensor location before installation. Use the listed fitment notes to confirm downstream placement and California-specific application details for the Mazda 6 and Mazda MPV.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for precise replacement fitment and dependable operation. The design focus on exact dimensions and contamination resistance supports consistent performance in the listed Mazda applications.

Related reading

This part fits 13 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionPositionNotes
2008Mazda6AutomaticDownstreamLoc. After Primary Catalyst; Calif.; OE Style
2007Mazda6AutomaticDownstreamLoc. After Primary Catalyst; Calif.; OE Style
2006Mazda6AutomaticDownstreamLoc. After Primary Catalyst; Calif.; OE Style
2005Mazda6AutomaticDownstreamLoc. After Secondary Catalyst; Calif.; OE Style
2003MazdaProtege—DownstreamOE Style
2003MazdaProtege5—DownstreamOE Style
2002MazdaProtege—DownstreamOE Style
2002MazdaProtege5—DownstreamOE Style
2001MazdaMPV—Downstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
2001MazdaProtege—DownstreamOE Style
2000MazdaMPV—Downstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
2000MazdaProtege—DownstreamOE Style
1999MazdaProtege—DownstreamOE Style
Directly replaces or cross-references 23 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-3079BorgWarner — OS1836BorgWarner — OS1919Bosch — 13688Bosch — 13868Bosch — 15555Delphi — ES20123Mazda — FP5018861AMazda — FP5018861A9UMazda — FSAX18861Mazda — FSAX188619UMazda — GY0218861BMazda — GY0218861B9UMazda — L36418861Mazda — L39618861ANTK — 22514NTK — 24697Standard Ignition — SG1082Standard Ignition — SG1165Walker Products — 250-24367Walker Products — 250-24732Walker Products — 350-34080Walker Products — 350-34265