Upstream sensors (sensor 1) are positioned in the exhaust manifold before the catalytic converter, while downstream. Mount the o2 sensor on the top side of the exhaust pipe, ideally between the 9 o’clock and 3 o’clock positions The illustrations below show several of the most common mounting configurations for oxygen sensors, depending on engine type and alignments
Lexus RX: How to Replace Oxygen Sensor | Clublexus
The terms used for each sensor location match the terms.
Don’t guess your o2 sensor location
This guide clarifies the difference between sensor 1, sensor 2, and bank 1/bank 2 placements across all engine types. The sensor number is telling us where on the exhaust system the o2 sensor or exhaust temperature sensor is mounted The 1st sensor is located closest to the engine and the last is located. A malfunctioning o2 sensor often triggers the check engine light, making location the first step in troubleshooting and replacement
This guide details the physical placement of these sensors based. Where are the oxygen sensors typically located Oxygen sensors are located in the vehicle’s exhaust system Most vehicles are equipped with two oxygen sensors
Locate your oxygen sensors easily
Learn how to identify bank 1 vs bank 2 and upstream vs downstream positions to fix your check engine light today. A vehicle’s (bank 1, sensor 2) o2 sensor will be located behind or downstream of the catalytic converter on the bank which corresponds to the engine’s first cylinder. This guide walks you through exactly how to replace an o2 sensor — from reading the diagnostic code to completing the drive cycle
