Denso 234-4742 Oxygen Sensor - Upstream Left
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4742 Oxygen Sensor - Upstream Left

Brand Denso 234-4742
Position Upstream Left
Connector Gender Male
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 29.92
Product line OE Style
Fits Mitsubishi · 15 vehicles

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

Heated sensor. Helps support faster operation and consistent emissions control.

Threaded mounting. Installs with a secure, specific-fit connection.

Cross-references ACDelco 213-1491, ACDelco 213-3075 and BorgWarner OS1868 for the same application. See all 24.

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Denso 234-4742 Oxygen Sensor for Montero

Denso 234-4742 is an OE Style heated oxygen sensor built for direct replacement on select Mitsubishi applications. It is engineered for the upstream left position on Mitsubishi Montero and Montero Sport models, with a specific-fit design that supports accurate installation and reliable signal performance.

Key Features

  • OE Style replacement oxygen sensor for exact-fit service
  • Heated sensor design for faster operating readiness
  • Specific fit with threaded mounting for direct installation
  • 4-wire configuration with male connector
  • Wiring harness length: 29.92 in.
  • Thread diameter: 0.708 in.
  • Built to Denso OE standards for replacement accuracy

Product Details

The Denso OE Style line focuses on direct replacement parts that match original equipment fit and function. This oxygen sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and consistent exhaust feedback. For Mitsubishi Montero and Mitsubishi Montero Sport applications, part number 234-4742 is a practical choice when replacing the upstream left sensor and restoring proper emissions-system operation.

This part cross-references Bosch 13412 and NTK 23524 for the same application.

Common Issues This Sensor Can Address

  • Check engine light related to oxygen sensor performance
  • Incorrect air-fuel mixture readings from a worn upstream sensor
  • Reduced fuel economy caused by slow or inaccurate exhaust feedback
  • Rough idle or hesitation tied to sensor degradation
  • Emissions test failure from a faulty oxygen sensor

Installation Notes and Tips

Verify the upstream left location before ordering, since this sensor is specific to select Mitsubishi Montero and Montero Sport models. Confirm connector style, wire count, and thread diameter against the original part. Threaded mounting helps support a direct replacement, but the sensor should be installed on a cool exhaust system and routed to avoid heat damage to the harness.

  • Fits 2001-2006 Mitsubishi Montero, Upstream Left
  • Fits 2001-2004 Mitsubishi Montero Sport, Upstream Left
  • Fits 1998-2000 Mitsubishi Montero, Upstream Left
  • Fits 1999-2000 Mitsubishi Montero Sport, Upstream Left

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent fit. The OE Style design is intended to deliver the correct part and fit for the listed Mitsubishi applications, including 2001-2006 Mitsubishi Montero and 2001-2004 Mitsubishi Montero Sport.

Related reading

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2006MitsubishiMonteroUpstream LeftOE Style
2005MitsubishiMonteroUpstream LeftOE Style
2004MitsubishiMonteroUpstream LeftOE Style
2004MitsubishiMontero SportUpstream LeftOE Style
2003MitsubishiMonteroUpstream LeftOE Style
2003MitsubishiMontero SportUpstream LeftOE Style
2002MitsubishiMonteroUpstream LeftOE Style
2002MitsubishiMontero SportUpstream LeftOE Style
2001MitsubishiMonteroUpstream LeftOE Style
2001MitsubishiMontero SportUpstream LeftOE Style
2000MitsubishiMonteroUpstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
2000MitsubishiMontero SportUpstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1999MitsubishiMonteroUpstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1999MitsubishiMontero SportUpstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
1998MitsubishiMonteroUpstream LeftCalifornia exempt parts can be used on pollution controlled vehicles in California.; OE Style
Directly replaces or cross-references 24 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-1491ACDelco — 213-3075BorgWarner — OS1868BorgWarner — OS1881Bosch — 13412Bosch — 15458Bosch — 15462Bosch — 15599Bosch — 15603Delphi — ES20195Mitsubishi — 1588A215Mitsubishi — MD342693Mitsubishi — MD360181Mitsubishi — MD369190Mitsubishi — MN158671Mitsubishi — MN158919Mitsubishi — MR578081NTK — 23524Standard Ignition — SG1114Standard Ignition — SG1127Standard Ignition — SG1455Standard Ignition — SG1459Walker Products — 250-24242Walker Products — 350-34097