The 2016 Honda Pilot uses four oxygen sensors: two upstream sensors located before the catalytic converters and two downstream sensors after the catalytic converters, arranged one pair on each bank of the V6 engine. The upstream sensors are accessible from the engine bay, while the downstream sensors sit along the exhaust pipes under the vehicle.
Understanding exactly where these sensors sit helps with diagnostics and maintenance. The Pilot’s 3.5-liter V6 is divided into two banks of cylinders; each bank carries an upstream sensor to monitor the air-fuel mixture before the catalyst and a downstream sensor to monitor catalytic converter efficiency after the catalyst. Below is a guide to locating them and safely working with them.
Where to locate the sensors on the 2016 Honda Pilot
The following outlines where to find each sensor by bank. Bank 1 is the side of the engine that contains cylinder 1; Bank 2 is the opposite side. Each bank has one upstream (pre-cat) sensor and one downstream (post-cat) sensor.
- Bank 1 Upstream (Oxygen Sensor 1): mounted in or just after the Bank 1 exhaust manifold, before the catalytic converter on that bank. Accessible from the engine bay side when the hood is open.
- Bank 1 Downstream (Oxygen Sensor 2): located on the exhaust pipe after Bank 1’s catalytic converter, toward the middle or rear of the vehicle under the engine area.
- Bank 2 Upstream (Oxygen Sensor 3): mounted in or just after the Bank 2 exhaust manifold, before the catalytic converter on that bank. Accessible from the engine bay side when the hood is open.
- Bank 2 Downstream (Oxygen Sensor 4): located on the exhaust pipe after Bank 2’s catalytic converter, toward the middle or rear of the vehicle under the engine area.
These four sensors are positioned to monitor the air-fuel mixture before the catalytic converters and the efficiency of the converters themselves for both banks of the engine.
Accessing and replacing the sensors safely
To work on the O2 sensors, follow safe procedures and use the correct tools. The steps below outline a careful approach, but always refer to the official service manual for torque specs and cautions.
- Park on level ground, apply the parking brake, and let the exhaust system cool before touching any components.
- If needed, lift the vehicle and support it securely with jack stands to access the underbody sensors.
- Identify each sensor by its bank and position (upstream vs downstream) before disconnecting anything.
- Disconnect the electrical connector from the sensor, taking care not to damage the wiring or connector pins.
- Using an oxygen sensor socket, carefully unscrew the sensor from its threaded port. If the sensor is stubborn, apply penetrating oil and allow it to soak before attempting removal again.
- Install the new sensor by threading it in by hand first, then tighten to the manufacturer’s specified torque. Do not apply anti-seize to the sensor tip; follow the manual’s guidance on thread lubrication if required.
- Reconnect the electrical harness, lower the vehicle, and start the engine to verify proper operation. Check for codes with an OBD-II scanner and take a test drive if needed to confirm no leaks or misfires.
Note: If you’re unsure about torque specs or the replacement process, consult the service manual or have a professional perform the replacement to avoid damage to the sensor or exhaust system.
Summary
On a 2016 Honda Pilot, you’ll find four O2 sensors—two upstream sensors before the catalytic converters and two downstream sensors after them—one set on each bank of the V6 engine. Upstream sensors are accessed from the engine bay, while downstream sensors are located along the exhaust pipes under the vehicle. Proper identification and careful handling are essential for diagnosis, maintenance, and replacement, with torque values and procedures best drawn from the official service manual or a qualified technician.