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o2 sensor

  1. ('06-'08) 2007 - Replacing entire engine bay fuse box?

    Lighting and Electrical
    I was chasing down a O2 sensor CEL...P0031 and P0037 related to the O2 sensor heater. It led me to check my fuses and I discovered that the SBF#5 (which the O2 sensor runs through, among other things) was so badly corroded that the fuse box male pins broke off. This is no longer a matter of...
  2. ('09-'13) 2009 - P0420 - Catalytic Converter Question?

    Problems, Maintenance, and Warranty
    Greetings, I have a 2009 Forester 150k miles that throws a P0420 code, it happened 4 times over the course of six months and has gone away after a few days until now. No symptoms of other issues, just the code and loss of cruise. A few questions. Is it worth trying to replace O2 sensor first to...
  3. ('01-'02) 2001 - Lower O2 Sensor Repeat Failure?

    Problems, Maintenance, and Warranty
    I have a 2001 Subaru Forester (base model) with 250,000 miles. Within the past 100,000 miles, I've changed my downstream O2 sensor 3 times. My check engine light just popped back on this last week, and my car has begun having some trouble idling again. I'm in full anticipation of it throwing a...
  4. ('03-'05) 2005 - EJ25 O2 Sensor Coupling won't come off engine bracket?

    EJ25 - 2.5L Non-Turbo (1998-2010)
    I'm removing my engine on my 05 X and at the point where I'm pulling all my grounds and harness points, including disconnecting the O2 sensor harness from the engine block. Please see the picture below. Question: Does the O2 harness that's on the metal bracket shown slide off this bracket? I...
  5. ('03-'05) 2005 XT - Front O2 Sensor P0031 Question? - SOLVED!

    Problems, Maintenance, and Warranty
    Nearly at 180,000 miles and the check engine light came on recently with flashing cruise control light. The error code is P0031. I ordered a replacement sensor which just arrived today. I started removing the plastic guard underneath the car to get to the front O2 sensor, but then noticed quite...