This AI-generated draft has not been independently verified for your vehicle. Confirm engine, trim, build date, tool fitment and torque specifications against the relevant service information before buying tools or starting work.
On the DT-generation Ram 1500, the upstream oxygen sensors thread straight into the exhaust manifolds on both the 5.7L Hemi and 3.6L Pentastar. The job itself is simple - unplug, unscrew, screw in the new one - but the passenger-side sensor on the Hemi is buried behind the steering shaft and frame rail, so most people end up pulling a front wheel and the inner fender liner for elbow room. A 22 mm slotted O2 socket plus a wobble extension does about 90 percent of these trucks; a 22 mm offset O2 wrench saves the rest.
The two things people get wrong: buying a downstream sensor (or the wrong bank) because the listings look identical, and cranking the new sensor in far too tight. The manifold boss is not forgiving - snug to roughly 22 ft-lb and stop. Also resist the urge to clean the new sensor with anything; brake cleaner or silicone on the tip will put the light right back on.
| Item | Type | Product search |
|---|---|---|
| OBD2 scan tool Code reader with live O2 data Confirm which sensor set the code and clear codes after the repair. | Required | search retailer |
| Floor jack 2.5 ton minimum Lift the front of the truck to reach the manifold sensors. | Required | search retailer |
| Jack stands 3 ton pair Support the truck on the frame rails while you work underneath. | Safety | search retailer |
| Wheel chocks Keep the truck from rolling with the rear wheels chocked. | Safety | search retailer |
| Lug nut socket 22 mm, 1/2 in drive, 6-point Remove the front wheel for side access on the passenger bank. | Required | search retailer |
| Breaker bar or impact wrench 1/2 in drive Break loose lug nuts torqued to 130 ft-lb. | Required | search retailer |
| Trim/fastener removal tool set Plastic pry set Pop the push-pin retainers on the inner fender liner and splash shields. | Recommended | search retailer |
| Socket set 7 mm, 8 mm, 10 mm, 13 mm, 1/4 and 3/8 in drive Fender liner screws, heat shield bolts, engine cover and wire harness brackets. | Required | search retailer |
| O2 sensor socket 22 mm (7/8 in) slotted, 3/8 in drive The slot clears the sensor pigtail so you can turn the sensor body. | Required | search retailer |
| Offset O2 sensor wrench 22 mm crowfoot / offset style, 3/8 in drive Only way into the tight passenger-side manifold pocket on some trucks. | Recommended | search retailer |
| Extensions and wobble/swivel 3/8 in drive, 3 in, 6 in, 12 in plus wobble extension Reach past the frame and steering shaft to the manifold bosses. | Required | search retailer |
| Ratchet 3/8 in drive, long handle Main driver for the sensor socket and extensions. | Required | search retailer |
| Torque wrench 3/8 in drive, 10-80 ft-lb Set the new sensor to spec so it seals without stripping the boss. | Recommended | search retailer |
| Torque wrench, 1/2 in 1/2 in drive, up to 150 ft-lb Retorque the wheel to 130 ft-lb. | Required | search retailer |
| Penetrating oil PB Blaster or equivalent Soak the sensor threads the night before to fight heat seizing. | Consumables | search retailer |
| Propane or MAP torch Hand torch Heat the manifold boss on a badly seized sensor (old sensor only). | Recommended | search retailer |
| Wire brush and shop rags Brass or steel brush Clean carbon off the manifold boss threads before installing. | Consumables | search retailer |
| Nickel anti-seize High-temp, sensor-safe Thin film on threads only if the new sensor comes dry - most come pre-coated. | Consumables | search retailer |
| Upstream oxygen sensor Mopar OE or equivalent, bank/position specific Bank 1 and Bank 2 Sensor 1 use different pigtail lengths - match by part number. | Parts | search retailer |
| Mechanic's gloves and eye protection Hot, sharp exhaust and falling rust/debris overhead. | Safety | search retailer |
| Drop light or headlamp LED The manifold bosses are buried and dark. | Recommended | search retailer |
5.7L Hemi eTorque and 3.6L Pentastar eTorque both use 22 mm (7/8 in) upstream sensors in the exhaust manifolds; the Pentastar's Bank 1 sensor is generally easier to reach from below, while the Hemi's passenger side usually needs the wheel and fender liner out. The 3.0L EcoDiesel has no conventional upstream O2 sensor at all - it uses NOx sensors (typically a 22 mm hex body with a dedicated NOx sensor socket) and a control module, and replacement often requires a dealer-level tool for the reset.
| Upstream oxygen sensor into exhaust manifold | about 22 ft-lb (30 Nm) - verify in the service manual |
| Front wheel lug nuts | 130 ft-lb (176 Nm) |
| Inner fender liner screws / heat shield bolts | verify in the service manual (snug only, sheet metal and plastic) |
A 22 mm (7/8 in) slotted oxygen sensor socket on 3/8 in drive. Add a 22 mm offset O2 wrench for the tight passenger-side manifold on the 5.7L Hemi, and a 22 mm lug socket on 1/2 in drive for the wheel.
Bank 1 is the passenger side on the Hemi, and Sensor 1 is the upstream sensor screwed into that exhaust manifold ahead of the catalytic converter. Confirm with your scan tool's live data rather than assuming, since wiring and codes can be miswired by a previous repair.
It is not required, but it is good practice on eTorque trucks to turn the ignition fully off and let the system power down. Do not disturb the orange 48V cabling, and note that if you disconnect the 12V battery the truck may relearn idle and throttle settings over the next few drive cycles.
Clear the code with a scan tool, then drive the truck through a full warm-up and some steady highway cruising so the O2 monitors can complete. If the light returns with the same code, suspect an exhaust leak near the sensor, a chafed pigtail, or the wrong part number.