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 code p0171 Thanks EDIT** will be …

Nov 28, 2023 · So i’m replacing my upstream sensor and i’ve heard a lot of talk on needing to get oem. I purchased a denso 234-9050 that is an exact fit, but it’s technically not the original part number. I’m …

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, …

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

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 …

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

Jun 5, 2017 · or Denso 234-9001? a/f sensor I think i just need 234-4189 o2 sensor correct? I'm just getting thrown off by the 'downstream' description since it's upstream from the cat. Is it …

Dec 24, 2010 · Completed the Post Cat O2 Sensor replacement today along with the trans filter and oil. O2 sensors were still a PITA but much easier with the reinforement plate removed. Thanks for all the …

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 …

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 …