NTK 27091 Air / Fuel Ratio Sensor - Downstream or Upstream
OE Quality 60-Day Returns
NTK
 Direct Fit 5-Wire A/F Sensor

NTK 27091 Air / Fuel Ratio Sensor - Downstream or Upstream

Brand NTK 27091
Position Upstream and Downstream
Wiring Harness Length 13.78
Sensor Type Heated
Thread Length 0.38
Universal Or Specific Fit Specific
Wire Quantity 5
Thread Diameter 18.00
Mounting Bracket Included No
Product line Direct Fit 5-Wire A/F Sensor
Fits Dodge and Ram · 32 vehicles

Direct-fit design. Built for specific applications with OE-equivalent replacement geometry.

Heated sensor. Heated construction helps the sensor reach operating temperature quickly.

5-wire configuration. Application-specific wiring layout for air/fuel ratio monitoring.

Cross-references Bosch 17212, DENSO Auto Parts 234-5090 and 68328896AA for the same application. See all 3.

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Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Air / Fuel Ratio Sensor options

Direct-Fit Air/Fuel Ratio Sensor

NTK 27091 is a specific-fit heated air/fuel ratio sensor for Ram 2500 and Ram 3500 applications. It is built as a 5-wire sensor with OE-equivalent design details for direct replacement service.

  • Specific-fit replacement for targeted applications
  • Heated sensor design for faster operating response
  • 5-wire configuration for air/fuel ratio monitoring
  • 18.00 mm thread diameter and 0.38 thread length
  • 13.78 wiring harness length for application-specific routing

Fitment and Application Details

Fits 2011-2012 Ram 2500, upstream and downstream. Fits 2011-2012 Ram 3500, upstream and downstream. Fits 2007-2010 Dodge Ram 2500, upstream and downstream. Fits 2007-2010 Dodge Ram 3500, upstream and downstream. This part cross-references Bosch 17212 and DENSO Auto Parts 234-5090 for the same application.

NTK’s Direct Fit 5-Wire A/F Sensor line is built for application-specific replacement work, with coverage focused on OE-style fit, form, and function. Part number 27091 is part of that direct-fit line and is intended for vehicles that use a heated 5-wire air/fuel ratio sensor.

Common Issues This Part Can Address

  • Fault codes related to air/fuel ratio sensor performance
  • Rough idle caused by inaccurate exhaust feedback
  • Fuel trim problems from a slow or degraded sensor
  • Emissions test failures tied to sensor response issues

Installation Notes and Quality

Use the vehicle’s original sensor location and connector style as a reference before installation. Confirm thread diameter, thread length, and harness length against the removed unit to ensure proper routing and seating. NTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications.

Related reading

This part fits 32 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersFuel TypePositionNotes
2012Ram2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Standard Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Standard Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Extended Crew Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Extended Crew Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Crew Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012Ram3500Crew Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Standard Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Standard Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Extended Crew Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Extended Crew Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Crew Cab Pickup6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011Ram3500Crew Cab Pickup6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010DodgeRam 2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010DodgeRam 2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010DodgeRam 3500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010DodgeRam 3500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009DodgeRam 2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009DodgeRam 2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009DodgeRam 3500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009DodgeRam 3500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008DodgeRam 2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008DodgeRam 2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008DodgeRam 3500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008DodgeRam 3500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007DodgeRam 2500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007DodgeRam 2500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007DodgeRam 3500—6.7LL6DIESELUpstreamB1S1; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007DodgeRam 3500—6.7LL6DIESELDownstreamB1S2; Equipped w/ 2 Sensors; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 17212DENSO Auto Parts — 234-509068328896AA