Oct 6, 2008 · The front O2 sensor (A/F or Air/Fuel sensor) is critical for correct engine operation, unlike the rear O2 sensor that just monitors the CAT. I would get an OEM/factory replacement.

Mar 12, 2003 · or Oxygen sensor input voltage maintained above the normal operating range. My first thought is the O2 sensor is bad but I just replaced it four months ago with a new Bosch …

Jul 10, 2007 · After finding out I needed a wideband o2 sensor to achieve a more precise tune, I set out to find out what wideband o2 sensor to get. Finally I found that narrow band (stock) o2 …

May 12, 2019 · Hi All, Just replaced the upstream O2 sensor on our 2012 Forester (150k miles), due to the following codes: P0420 Catalyst System Efficiency Below Threshold P0171 System …

Mar 15, 2006 · A 3 wire O2 sensor has a heating element built in so that it can be placed farther from the motor. Use this type if you want to mount it where the pipes from each side of the …

Apr 14, 2003 · The O2 sensor is necessary for the efficient operation of the engine. Why did you not reinstall it? My 4runner wont start if my sensor is unplugged. I dont wanna get too in depth, …

Dec 21, 2009 · Was hoping to just read voltage like stated with the .250v - .900v variation but if I'm guessing the complexity of the new 4-wire o2 sensors correctly, I can't simply tap in to one …

Aug 22, 2019 · Before the 2nd failed smog test I removed the semi new Denso o2 sensor and spacer and replaced with a new Bosch that has a shorter snout, even through I try to stick to …

Nov 6, 2022 · The Bosch oxygen sensor lasted me for two years and keeps working. However, the Denso sensor breaks after one year. Like the two other members suggested, I would test …

Oct 12, 2008 · The denso o2 sensor is a good part but a bad o2 sensor is not going to give you a long crank time the o2 sensor has nothing to do with fuel delivery on start up.