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catalytic converter

  1. Problems, Maintenance, and Warranty
    I replaced the OEM exhaust manifold in my 2009 Forester with an Eastern Catalytic Manifold from Rock Auto. Had the install verified by my mechanic. After about 200 miles the P420 code came back on. Mechanic states that the rear O2 sensor reads all over the place while running, 100mV - 1000mV...
  2. Problems, Maintenance, and Warranty
    My Subaru initially had a California emissions catalytic converter. The converter now needs replacing and I was wondering if it would cause an error code if I replaced it with a non California emissions catalytic converter. Any experience?
  3. 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...
  4. EJ25 - 2.5L Non-Turbo (1998-2010)
    Hi ladies and gentlemen, I need help finding UEL headers for my 07 NA Forester 2.5X. I'm not looking for big performance or an ear rape exhaust, I just want that Subaru rumble. That's one of the reasons for buying the car, the Subaru rumble. I've been looking online for days for headers that...
  5. Forester Shopping
    Hi folks, just test drove a 2017 forester limited with about 50k miles on it. Couple issues: it smells a bit smoky, the AC is nonexistent, and the dealer replaced the catalytic converter when they took it in. The dealer is prepared to do ozone treatment (hadn't been done) for the smoke and...
  6. Problems, Maintenance, and Warranty
    Question for anyone who might have some advice: I love Foresters...now on my second one, an '07 2.5X. It's a manual and it's been really good to me these past few years... BUT, it's needed work recently and now I need help. There was a P0420 code that kept coming back, so my mechanic put in a...
  7. EJ25 - 2.5L Non-Turbo (1998-2010)
    Background: N/A 2001 Forester S, Custom 2.25 inch magnaflow catback, stock headers, stock 1.75 inch(?) dual cat pipe (gutted). My goal is to acheive a nice tone, but also be decently (noticably) loud. Which would be louder? A: My stock gutted dual cat pipe OR B: My stromung Single highflow...
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