O2 Oxygen Sensor Upstream Downstream for Dodge Nitro (2007-2012) 3.7L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2007-2012 Dodge Nitro (KA)

What it Does: This 4-piece direct-fit oxygen sensor kit replaces both upstream and downstream O2 sensors on the 2007-2012 Dodge Nitro (KA) equipped with the EKG 3.7L V6 engine to restore closed-loop air-fuel ratio feedback and catalytic converter monitoring.

The Stock Dodge Nitro O2 Sensor Failure

On the KA Dodge Nitro equipped with the EKG 3.7L PowerTech V6, factory exhaust sensors endure extreme thermal cycling, carbon soot accumulation, and internal heater circuit fatigue. Over time, contaminated zirconia elements develop slow voltage switching rates, while internal heater coils open up under exhaust vibration. Because the PCM relies on rapid millivolt transitions to trim fuel delivery, lazy or shorted factory sensors trigger P0135, P0155, P0171, and P0174 fault codes while forcing rich open-loop operation.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Triggered heater circuit or slow-response codes such as P0130, P0135, P0150, P0155, or downstream catalyst efficiency faults like P0420 and P0430.
• Rich Exhaust & Fuel Economy Drop: Sluggish upstream switching causes the PCM to over-fuel, producing carbon-fouled spark plugs and black tailpipe soot.
• Rough Idle & Hesitation: Skewed air-fuel trim feedback leads to unstable closed-loop idle, surging under light throttle, and failed emissions inspections.

The Direct-Fit Matched Oxygen Sensor Solution

Replacing all four sensors simultaneously as a matched set prevents uneven bank-to-bank fuel trims and restores factory stoichiometric control on your KA chassis. Each sensor utilizes a fast-light-off heated zirconia sensing element housed in corrosion-resistant stainless steel to withstand underbody moisture and exhaust heat soak. Pre-wired OEM-style connectors, direct-fit protective wire sleeves, and factory-spec thread geometry eliminate splicing and ensure accurate Bank 1 and Bank 2 PCM calibration right out of the box.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2007-2012 Dodge Nitro — 3.7L (Confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the KA Nitro?

Yes. This is a direct fit for the 2007-2012 Dodge Nitro equipped with the EKG 3.7L V6 engine. Does not fit 4.0L V6 models or diesel variants; confirm your engine displacement before ordering.

Will this clear P0135, P0155, or P0420 codes?

Yes, when caused by degraded sensors. Replacing faulty upstream and downstream units resolves heater-circuit and slow-response codes like P0135 and P0155, though persistent P0420/P0430 codes after replacement indicate a failing catalytic converter rather than a bad 234-4274 sensor.

Are wiring harnesses and plugs ready for direct installation?

Yes. Each sensor includes direct-fit OEM-style connectors for plug-and-play installation into factory exhaust bungs—apply anti-seize sparingly only to the threads (avoiding the sensor tip) and torque to spec.

The Dodge Heavy-Duty Standard

Built for the thermal demands of daily driving and towing on the KA SUV platform, this 4-sensor kit restores accurate closed-loop fueling and long-term thermal durability. Maintain clean emissions compliance and consistent EKG 3.7L fuel economy without cutting or splicing factory wiring.