Jul 8, 2012 · Anyone know the difference between the upstream and downstream o2 sensors? My truck sounds like a box of rocks under load! I have the lean condition...

May 28, 2015 · The upstream air/fuel sensor has fewer ports for sampling the exhaust and also the shorter wire. Denso's description of the two sensors is exactly the same though, at least on the …

Mar 19, 2022 · Anyone have some information on the 02 sensors compatibilities between the Sensor 1 locations (upstream) vs. the Sensor 2 locations (downstream)? My X3 triggered the engine light, …

Apr 1, 2022 · o2 Sensor Bank 2 downstream running low voltage only at idle or stop and go conditions but is throwing only a bank 1 fault.

Nov 28, 2023 · I swapped the two downstream O2 sensors from side to side to see if the code would follow the O2 sensor, but that just proved it wasn't the sensor. Also, the upstream sensor is not an …

Nov 22, 2021 · My upstream 02 Sensor reads what I think is normal at around 0.995 to 1.015. [\u001AATTACH] But my downstream sensor reads all over the place from 0.135 to...

Feb 19, 2021 · Upstream vs downstream 02 sensor? Discussion in ' 1st Gen. Tacomas (1995-2004) ' started by Off-grid yota, Feb 19, 2021.

Mar 14, 2019 · Downstream isn't as critical as the upstream a/f sensor. Denso or NTK are both great choices for Tacoma.

Jan 11, 2011 · I am trying to understand why the part numbers for OEM Downstream O2 sensors are different from Toyota, 89465-04340 (left) and 89465-04350 (right). They are both O2 sensors and …

Jun 5, 2017 · Denso 234-4189? o2 sensor or $145 Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles Denso 234-9001? a/f sensor I …