O2 Oxygen Sensor Upstream Downstream for Ford Explorer (2013-2015) 3.5L Turbo

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2013-2015 Ford Explorer (U502)

What it Does: This 4-piece upstream and downstream oxygen sensor kit restores accurate air-fuel ratio feedback and catalyst monitoring for the 2013-2015 Ford Explorer (U502) equipped with the 3.5L EcoBoost GTDI V6 engine.

The Stock Ford Explorer O2 Sensor Failure

On the U502 platform powered by the twin-turbocharged 3.5L EcoBoost GTDI V6, factory upstream wideband and downstream narrowband oxygen sensors endure severe exhaust gas temperatures and turbocharger heat soak. Repeated thermal cycling fractures the internal zirconia ceramic element, degrades the internal heater circuit, and fouls the sensing tip with carbon soot or oil vapor. This causes sluggish voltage switching, skewed fuel trims, and persistent OBD-II fault codes such as P0130, P0150, P0135, and P0420.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light & DTCs: Triggers codes like P0130, P0150 (slow response), P0135/P0141 (heater circuit failure), or P0420/P0430 catalyst efficiency faults.
• Rich Running & Fuel Loss: Skewed lambda signals force open-loop enrichment, causing rough idle, tailpipe soot, and reduced fuel economy under boost.
• Hesitation & Failed Emissions: Delayed closed-loop feedback causes throttle stumble during turbo spool and prevents emissions readiness monitors from setting.

The Direct-Fit Heated Zirconia Oxygen Sensor Solution

Replacing all four Bank 1 and Bank 2 sensors as a matched set restores synchronized closed-loop fueling and post-catalyst monitoring across both exhaust banks. Each sensor uses a high-purity zirconia ceramic sensing element, laser-welded stainless steel housing to prevent exhaust leaks, and a fast-acting internal heater for rapid light-off. Factory-length shielded harnesses and keyed weatherproof connectors ensure plug-and-play installation into stock bungs with zero splicing, directly replacing 234-5113, 234-4489, and 234-4491.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2013 Ford Explorer 3.5L Turbo (U502)
• 2014 Ford Explorer 3.5L Turbo (U502)
• 2015 Ford Explorer 3.5L Turbo (U502)

Frequently Asked Questions & Fitment Warnings

Does this fit the U502 Explorer?

Yes. This is a direct fit for the 2013-2015 Ford Explorer (U502) equipped with the 3.5L EcoBoost GTDI V6 (3.5L Turbo) engine. It does not fit naturally aspirated 3.5L Ti-VCT or 2.0L EcoBoost models; confirm your engine before ordering.

Will this clear P0130, P0135, or P0420 codes across both banks?

Yes, when faulty sensors are the root cause. Replacing all four upstream and downstream sensors resolves heater circuit and slow-response DTCs like P0130, P0135, and P0150 on Bank 1 and Bank 2. If P0420/P0430 returns after installation, inspect the catalytic converters for substrate damage.

Is wire splicing or custom hardware required for installation?

No. All four sensors feature OEM-style keyed connectors and direct-fit threads replacing 234-5113, 234-4489, and 234-4491. Torque sensors into clean exhaust bungs and keep O2-safe anti-seize strictly on the threads, away from the sensing tip.

The Ford Precision Standard

Built for the thermal demands of twin-turbocharged EcoBoost exhaust streams, this matched 4-piece sensor kit keeps your U502 Explorer operating with accurate closed-loop fueling and CEL-free emissions compliance. Reliable lambda feedback protects your turbochargers and catalytic converters from rich-running fuel wash and excessive exhaust temperatures.