NTK 21535 Oxygen Sensor - Downstream Left or Downstream Right
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NTK
 Direct Fit Oxygen Sensor

NTK 21535 Oxygen Sensor - Downstream Left or Downstream Right

Brand NTK 21535
Position Downstream Right and Downstream Left
Wiring Harness Length 23.5000
Sensor Type Heated
Universal Or Specific Fit Specific
Wire Quantity 4
Thread Diameter 18.000
Mounting Type Threaded
Product line Direct Fit Oxygen Sensor
Fits Cadillac · 4 vehicles

Direct fit design. Specific-fit replacement for straightforward installation and OE-style service.

Heated sensor. Supports accurate exhaust feedback with a 4-wire configuration.

OE-spec tested. Manufactured and verified to meet or exceed original equipment standards.

Cross-references DENSO Auto Parts 234-4688, Quality-Built 15433 and 75-2650 for the same application. See all 7.

$89.63Free shipping
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Order total $89.63
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Direct Fit Oxygen Sensor Overview

NTK Direct Fit Oxygen Sensor 21535 is a specific-fit heated oxygen sensor built for emission control applications. It uses a threaded mounting design with a 23.5-inch wiring harness and 4-wire configuration for direct replacement service.

Key Features

  • Heated oxygen sensor for precise exhaust feedback
  • Specific-fit design for direct replacement applications
  • Threaded mounting with 18 mm thread diameter
  • 23.5-inch harness length for proper routing
  • 4-wire construction for OE-style signal control

Fitment Details

Compatible with 1997-1998 Cadillac Catera, downstream right. Compatible with 1997-1998 Cadillac Catera, downstream left. This part cross-references DENSO Auto Parts 234-4688 for the same application.

What It Is Used For

  • Replacing a worn or slow-responding oxygen sensor
  • Restoring exhaust mixture feedback to the engine control system
  • Addressing emissions-related fault codes tied to sensor performance
  • Correcting drivability issues caused by inaccurate air-fuel data

Installation Notes and Tips

Use the threaded mounting style and harness length to confirm routing before installation. Verify the connector layout and downstream position against the original sensor on the Cadillac Catera. The 18 mm thread diameter and 4-wire design should match the vehicle’s OE-style application requirements.

Quality Assurance

NTK is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier. This sensor is manufactured and tested to meet or exceed OE specifications for fit, form, and function.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1998CadillacCatera3.0LV6Downstream RightDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
1998CadillacCatera3.0LV6Downstream LeftOxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor
1997CadillacCatera3.0LV6Downstream RightDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
1997CadillacCatera3.0LV6Downstream LeftOxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor
Directly replaces or cross-references 7 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
DENSO Auto Parts — 234-4688Quality-Built — 1543375-2650213-426990540985OS213SG744