O2 Oxygen Sensor Upstream Downstream for Ford Fusion (2011-2012) 3.0L

Direct-Fit O2 Oxygen Sensor Kit for 2011-2012 Ford Fusion (CD3)

What it Does: This 4-piece oxygen sensor kit monitors upstream and downstream exhaust oxygen on the 2011-2012 Ford Fusion CD3 Duratec 30 3.0L V6 for closed-loop fuel control.

The Stock Ford Fusion O2 Sensor Failure

On the CD3 chassis powered by the Duratec 30 3.0L V6, factory zirconia sensing elements degrade from continuous thermal cycling, exhaust soot glazing, and internal heater coil burnout. As platinum electrodes foul from oil or coolant residue, response time slows and voltage switching drifts out of specification. This sluggish feedback forces rich open-loop fueling, triggering fault codes including P0135, P0155, P0171, and catalyst codes like P0420/P0430.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light: Stored P0135, P0155, or P0420/P0430 codes from heater failure or lazy switching.
• High Fuel Consumption: Delayed feedback forces rich fueling, tailpipe soot, and rough idle.
• Emissions Failure: Inaccurate downstream readings prevent catalyst readiness monitors from setting.

The Direct-Fit Upstream & Downstream O2 Sensor Solution

Replacing all four sensors as a matched set restores balanced Bank 1 and Bank 2 fuel trim control on the Duratec 30 3.0L V6. Each unit pairs a corrosion-resistant stainless steel housing and laser-welded shield with a fast-acting ceramic sensing element built to withstand exhaust thermal shock. Pre-terminated OEM-style connectors and threaded bodies install directly into factory exhaust bungs without splicing, cutting, or wiring modifications.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2011-2012 Ford Fusion 3.0L V6 (2 Upstream, 2 Downstream)

Frequently Asked Questions & Fitment Warnings

Does this fit the CD3 Fusion?

Yes. Direct fit for the 2011-2012 Ford Fusion Duratec 30 3.0L V6. Excludes 2.5L, 3.5L, 3.7L engines, Ford Escape 3.0L, and Lincoln models.

Will this clear P0135 or P0420 codes?

Yes, if sensor-related. New 234-5038 and 234-4490 sensors restore heater resistance and switching speed to clear faults.

Are all four sensors ready to install?

Yes. All 4 pre-wired sensors are included; clean bung threads and torque to factory spec.

The Ford Precision Standard

Engineered for the CD3 platform, this 4-sensor kit restores closed-loop air-fuel accuracy and emissions readiness, keeping your Duratec 30 3.0L V6 running cleanly.