O2 Oxygen Sensor Upstream Downstream for Ford F-150 (2015-2016) 3.5L

Direct-Fit O2 Oxygen Sensor Kit for 2015-2016 Ford F-150 (P552)

What it Does: This 4-piece upstream and downstream O2 sensor kit monitors exhaust air-fuel ratios and catalyst efficiency on the 2015-2016 Ford F-150 (P552) 3.5L V6.

The Stock Ford F-150 O2 Sensor Failure

Factory oxygen sensors on the P552 F-150 equipped with the 3.5L V6 endure extreme thermal cycling, soot buildup, and exhaust condensation. Over time, internal zirconia ceramic elements suffer contamination, slowing voltage response and skewing closed-loop fuel trims. Heater circuit resistance eventually spikes or opens, delaying warm-up activation. These faults trigger persistent P0135, P0155, or P0420/P0430 diagnostic trouble codes.

Common Symptoms of Failing OEM Oxygen Sensors

• Check Engine Light: Triggers P0130, P0150, P0135, or P0420/P0430 codes.
• Erratic Fuel Trims: Corrupted feedback causes rough idle and throttle hesitation.
• Higher Fuel Consumption: Open-loop defaulting lowers MPG and fails emissions tests.

The Direct-Fit Zirconia O2 Sensor Solution

Replacing all four sensors as a matched set restores balanced Bank 1 and Bank 2 feedback across upstream and downstream exhaust bungs. Each unit features a laser-welded stainless housing and thermal-shock-resistant zirconia element to prevent leakage and heater burnout. Pre-terminated factory connectors—replacing 234-4961, 8F9Z-9F472-G, 8F9Z-9F472-H, and FL3Z-9G444-C—provide plug-and-play installation. Consistent millivolt output stabilizes PCM fueling under load.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2015-2016 Ford F-150 3.5L (Confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the P552 F-150?

Yes. Fits 2015-2016 Ford F-150 (P552) 3.5L models. Excludes 2.7L and 5.0L engines; verify OEM part numbers first.

Will this clear P0135 or P0420 codes?

Yes, if sensors caused the fault. Fresh upstream and downstream units resolve heater and response codes, unless the catalyst itself is damaged.

Are connectors ready for bolt-on installation?

Yes. Pre-wired harnesses install directly into OEM bungs using a 22mm O2 socket without cutting or splicing.

The Ford Heavy-Duty Standard

Built for sustained exhaust heat and towing loads on the P552 chassis, matched sensor replacement maintains accurate PCM fueling under boost and grade climbs.