Denso 234-4395 Oxygen Sensor - Downstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4395 Oxygen Sensor - Downstream

Brand Denso 234-4395
Position Downstream
Connector Gender Male
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 25.63
Product line OE Style
Fits Mazda · 2 vehicles

OE style replacement. Precision-built for an exact, first-time fit.

Heated sensor. Helps support efficient engine performance and fuel economy.

Aluminum oxide trap layer. Protects the ceramic element for longer service life.

Cross-references ACDelco 213-3892, Bosch 15783 and Delphi ES20128 for the same application. See all 8.

$94.32Free 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 $94.32
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 234-4395 Oxygen Sensor for Mazda 6

Denso 234-4395 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for the downstream position on 2006-2007 Mazda 6 models, helping maintain accurate exhaust feedback for proper engine management.

Key Features

  • Specific-fit oxygen sensor for the downstream location
  • Heated sensor design for faster operating response
  • 4-wire configuration with male connector
  • Threaded mounting type with 0.708 in. thread diameter
  • 25.63 in. wiring harness length for application-specific routing
  • OE-style construction from Denso, part number 234-4395

OE-Style Design and Application

Denso’s OE Style line focuses on direct replacement parts built to strict original-equipment standards. This oxygen sensor uses precision-built components for proper fit and dependable signal output, and it includes an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination. For drivers searching for a downstream oxygen sensor for 2006-2007 Mazda 6, Denso 234-4395 is a direct-fit solution.

This part cross-references Bosch 15783 for the same application.

What This Oxygen Sensor Helps Address

  • Check engine light related to oxygen sensor performance
  • Incorrect air-fuel mixture readings from a worn downstream sensor
  • Reduced fuel economy caused by inaccurate exhaust feedback
  • Slow sensor response after heat cycling or contamination
  • Emissions system faults on Mazda 6 models

Installation Notes

Fits 2006-2007 Mazda 6, downstream. Confirm the connector style, wire count, and threaded mounting location before installation. Use the vehicle’s original routing path for the 25.63-inch harness and verify the sensor seats fully in the exhaust bung. This Denso 234-4395 oxygen sensor is specific fit, so matching the exact position is important for proper installation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and performance. The OE-style design supports accurate replacement on Mazda 6 applications, and the part number 234-4395 is built to match the specified downstream configuration.

Related reading

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2007Mazda6DownstreamOE Style
2006Mazda6DownstreamOE Style
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-3892Bosch — 15783Delphi — ES20128Mazda — L3M718861CMazda — L3M718861C9UNTK — 24443Walker Products — 250-24791Walker Products — 350-34065