On the 13th-gen F-150 this is a one-fastener job that lives or dies on access and on whether the sensor comes loose. The 5.0 V8 and 3.3 V6 put the upstream sensors in the exhaust manifolds where you can usually reach them from underneath with a slotted 7/8 in sensor socket and a long extension. The 2.7 and 3.5 EcoBoost put them in the turbo outlet pipes, and most people end up pulling the front wheel and folding back the inner fender liner to get a wrench on the driver's side.
The two things that go wrong: people fight a stone-cold, rust-welded sensor until the hex rounds off, and people buy a cheap universal splice-in sensor. Soak the threads, warm the exhaust slightly, use a proper slotted socket or 7/8 in offset wrench, and buy the direct-fit Motorcraft sensor for your bank. Also confirm with live data which sensor is actually bad - a rich or lean bank code often points at a boost leak, a leaking exhaust joint upstream of the sensor, or an injector, not the sensor itself.
| Item | Type | |
|---|---|---|
| OBD2 scan tool Live-data capable, reads Ford P0131/P0151/P2195 style codes Confirms which bank and sensor is faulty before you buy parts, and clears codes after. | Required | shop |
| Floor jack 2-ton minimum, lifting at frame rails Raises the truck for underbody access to the manifolds and downpipes. | Required | shop |
| Jack stands 3-ton pair, frame rail placement Supports the truck while you work underneath. | Safety | shop |
| Wheel chocks Keeps the truck from rolling while raised. | Safety | shop |
| Penetrating oil PB Blaster or equivalent Soak the sensor threads 15-30 minutes before removal to reduce the chance of seizing. | Consumables | shop |
| Breaker bar or impact driver 1/2 in drive breaker bar, or cordless impact Extra leverage on a heat-welded sensor; short impact bursts often break them free without rounding. | Recommended | shop |
| Lug nut socket 21 mm or 22 mm 6-point, 1/2 in drive (check your wheels) Wheel removal for fender-liner access on EcoBoost trucks. | Required | shop |
| Socket set 7, 8, 10, 13 mm, 1/4 and 3/8 in drive Engine cover, inner fender liner screws, splash shields, heat shield and wire-loom brackets. | Required | shop |
| Trim/panel removal tool Plastic pry set Pops the plastic pin-type fasteners in the inner fender liner without breaking them. | Recommended | shop |
| O2 sensor socket 7/8 in (22 mm), slotted for the harness, 3/8 in drive The main tool for loosening and installing the sensor with the pigtail attached. | Required | shop |
| Offset O2 sensor wrench 7/8 in (22 mm) crowfoot/offset style Needed where the sensor socket will not fit, especially the EcoBoost downpipe sensors. | Required | shop |
| Extensions and wobble/swivel 3/8 in drive, 3 in, 6 in, 12 in plus universal joint Reaches the sensor from below or from the wheel well around turbo plumbing. | Required | shop |
| Flex-head ratchet 3/8 in drive Lets you work the sensor loose in the tight space above the turbo outlet. | Recommended | shop |
| Small flat screwdriver or pick Releases the locking tab on the sensor's electrical connector without snapping it. | Recommended | shop |
| Wire brush and thread chaser M18 x 1.5 O2 port thread chaser Cleans carbon from the boss threads so the new sensor starts easily and seals. | Recommended | shop |
| Torque wrench 3/8 in drive, 10-80 ft-lb range Sets the sensor to spec; overtightening galls the threads in the manifold. | Required | shop |
| Anti-seize compound Nickel-based, O2-sensor safe Only if the new sensor's threads are not pre-coated; keep it off the sensor tip. | Consumables | shop |
| Upstream oxygen sensor Motorcraft HEGO, correct bank/part number for your engine and year The replacement part; aftermarket universal splice-in sensors are a common cause of new fault codes. | Parts | shop |
| Mechanic's gloves and safety glasses Hot exhaust, sharp brackets and falling rust scale. | Safety | shop |
All upstream sensors in this generation use a 7/8 in (22 mm) hex, so the sensor socket is the same. Location differs: 3.3 V6 and 5.0 V8 sensors thread into the exhaust manifolds and are reached from below with 3/8 in extensions; 2.7 and 3.5 EcoBoost sensors thread into the turbocharger outlet pipes and generally require the front wheel off plus 7 mm and 8 mm drivers for the inner fender liner fasteners, and an offset 7/8 in wrench. Early 2015-2016 3.5 non-turbo Cyclone V6 trucks also have manifold-mounted sensors like the 5.0.
| Upstream HEGO oxygen sensor | approx 35 ft-lb (48 Nm) - verify in the service manual |
| Wheel lug nuts | 150 ft-lb (204 Nm) |
| Inner fender liner screws / plastic fasteners | hand tight, verify in the service manual |
The 7/8 in (22 mm) sensor hex and the bank layout (Bank 1 passenger, Bank 2 driver) are consistent across this generation, but confirm the exact torque figure and your sensor's part number for your specific engine and model year before installing.
Bank 1 is the passenger side on the 2.7 EcoBoost, 3.5 EcoBoost, 3.3 V6 and 5.0 V8. Sensor 1 is the upstream sensor ahead of the catalytic converter; sensor 2 is the downstream one after it.
A 7/8 in (22 mm) slotted oxygen sensor socket on a 3/8 in drive. Keep a 7/8 in offset or crowfoot O2 wrench on hand too, because the EcoBoost downpipe sensors often will not clear a straight socket.
No relearn procedure or programming is required. Clear the stored codes with a scan tool and drive the truck until the oxygen sensor monitor runs and sets to ready, then rescan to confirm nothing returns.
You can, but it is the most common cause of comebacks on these trucks - crimped or poorly soldered splices cause intermittent heater-circuit codes like P0135 and P0155. A direct-fit Motorcraft or quality OE-equivalent sensor with the factory connector is worth the extra money.