P0135 on the 2016 Ford F-150
The 2016 Ford F-150, the second year of the aluminum-body 13th generation, offers the 3.5L EcoBoost V6, 5.0L Coyote V8, 2.7L EcoBoost V6, and 3.5L Ti-VCT V6. At nine to ten years old, a P0135 code is a natural wear-item failure. The upstream O2 sensor heater on Bank 1 has reached the end of its service life after years of thermal cycling in the harsh exhaust environment.
A Decade of Hard Work
Most 2016 F-150s have seen serious mileage and hard use. Whether towing boats, hauling materials, or daily commuting, these trucks accumulate thermal cycles rapidly. The O2 sensor heater, a small resistive coil inside the sensor housing, has been heating and cooling with every drive for nearly a decade. At this age, heater failure is expected rather than surprising.
Common Causes
- End-of-life heater element (High Likelihood): The Motorcraft sensor's heater coil has simply worn out from years of use. This is the primary cause on vehicles of this age. The 80,000 to 150,000 mile lifespan of most O2 sensor heaters aligns with where many 2016 F-150s are now.
- Severe wiring corrosion (Medium Likelihood): Nearly a decade of road salt, moisture, and debris has corroded the sensor connector and wiring. The F-150's underbody takes significant abuse over 150,000-plus miles. Green corrosion on pins, crumbling insulation, and frayed wires are common findings.
- Blown fuse from wiring short (Medium Likelihood): Aged and corroded wiring can develop shorts that blow the O2 heater fuse. Check the power distribution box fuse first, but also investigate the wiring if the fuse keeps blowing.
- Exhaust leak at manifold (Low Likelihood): Exhaust manifold gaskets and bolts deteriorate over time. An exhaust leak near the O2 sensor can overheat the wiring and damage the connector, contributing to heater circuit failure.
Diagnosis
No Warranty Coverage
The 2016 F-150 has exceeded both the basic and emissions warranties. This is an out-of-pocket repair. The good news is that the parts are affordable and the job is well-documented for this popular truck.
Start with the Fuse
Check the O2 heater fuse in the power distribution box under the hood. If blown, note it and investigate for shorts before just replacing it.
Underbody Inspection
The F-150's frame and exhaust are fully exposed underneath. Raise the truck and inspect the Bank 1 sensor wiring from the passenger-side exhaust manifold along the frame. After ten years, expect significant corrosion, especially in salt-belt states. Clean the connector area before disconnecting.
Sensor Removal Challenge
A decade-old sensor will be bonded to the exhaust manifold by corrosion. Apply penetrating oil liberally and let it soak overnight if possible. Run the engine to warm the manifold before attempting removal. Use a quality 22mm O2 sensor socket. If the hex rounds off, you may need a six-point socket, pipe wrench, or even a welder to attach a nut for leverage. Have a backup plan before you strip the sensor.
Repair Costs
Motorcraft sensor: $55 to $130. Aftermarket: $20 to $50. Shop labor: $100 to $180, potentially more if the sensor is severely seized. Total: $155 to $310. DIY saves labor cost but requires patience with seized threads. Budget an hour or more for removal on an aged exhaust system.
Keep the Truck Running Right
The 2016 F-150 retains value well, and many owners plan to keep these trucks for years to come. A $150 O2 sensor replacement protects catalytic converters worth $600 to $1,800, restores fuel economy, and allows you to pass emissions testing. For a truck that may have another 100,000 miles of life ahead, this is basic maintenance that pays for itself.