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...

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 …

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 …

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...

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 …

May 29, 2022 · Car threw a code that indicated the downstream O2 sensor was not providing a signal. Went to Rock Auto and ordered the Bosh replacement. It looks different. Is this the right sensor for …

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 22, 2024 · I need help interpreting these oxygen sensor scanned readings. 2003 525i 160k miles Both upstream sensors are new Bosch Both downstream sensors are original Previously I replaced …

Jan 9, 2023 · It is only there to confirm that the main catalytic converter is working, and this is an EPA requirement. When everything is working properly, the upstream sensor (s) will switch voltage rapidly …

Mar 8, 2012 · From the Denso website, it appears there are two different OEM O2 sensors, one for the upstream (234-4624) and one for the downstream (234-4603). The universal sensor, however, is the …