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Apr 3, 2011 · Do you guys know which brand and model of front and rear O2 sensor is the same as the Subaru sensors from the dealer? any pictures with stamped logos/numbers or anyone want to check? I've searched a ton for this info, but all I can find is people doing the usual talk of "just get it at the dealer".
Jun 6, 2018 · In my 2004 LL Bean Outback I’ve changed both front O2 sensors. I tested those 2 with a volt meter, which were showing good, and I also replaced the rear O2 sensor, with a sensor that was good when it last worked in my 2001 VDC Outback.
- Subaru Impreza P0420 OBDII Code Defined
- Subaru Impreza P0420 Code Symptoms
- P0420 Diagnosis: Subaru Impreza
- Conclusion
P0420is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. Here’s the technical definition for your car: P0420: Catalyst System Efficiency Below Threshold (Bank 1)
The P0420 code in a Subaru Impreza will often be thrown if one of your car’s oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. For most people, the first sign that anything is wrong is the service engine soon light coming on. Here are the typical symptoms that something is wrong when you have co...
The most common fix for P0420 in the Subaru Impreza is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Impreza into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Subaru Impreza:
If there are no codes other than P0420 present, and the O2 sensors are recording data properly, it’s likely your Subaru Impreza’s catalytic converter has failed, which is what this code is reporting.
Mar 20, 2022 · O2 sensors should last over 100K miles. The $23 scan tool I recommended in my #2 post can be usefull in diagnosing pollution problems. When the trim is over 20% it should throw a code.
Mar 14, 2016 · The OEM front O2 sensor is an enhanced narrowband, with a range approaching a true wideband sensor. The problem is, under boost, the sensor is pressurized and cannot be accurately used for tuning. The OEM ECU has some compensation for this internally, but a pressurized AFR sensor will not produce an accurate reading.
Mar 15, 2015 · So, before I even consider shelling out $500+ for a new catalytic converter, I'm thinking it might be wise to replace the O2 sensors, as suggested in a previous thread. Based on info here, I'll likely start with the upstream sensor, then the downstream, if necessary.
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Apr 26, 2022 · The O2 sensor lets the computer know if the fuel mix is burning rich (not enough oxygen) or lean (too much oxygen). Knowing the ratio of fuel to air allows your vehicle’s engine to make any...
