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p0420

  1. ('09-'13) 2009 - Rear o2 sensor spacer to 'fix' p0420?

    Problems, Maintenance, and Warranty
    I have a 2009 Forester X that's showing p0420 and have been trying the other fixes to delay replacing the Catalytic Converter until I have money to do so. I have no performance issues right now. Does anybody have experience using an o2 sensor spacer for the rear o2 sensor? What size are the...
  2. ('09-'13) 2010 - P0420 & Low Idle - I've Tried Everything?

    Problems, Maintenance, and Warranty
    Hey guys, Started having issues months ago when my 2010 Subaru Forester (133K miles) threw the P2096 code. I started replacing things one at a time, solving the P2096 code, but now I have the P0420 that keeps coming back. Since the beginning I've had intermittent issues with cold starts and the...
  3. ('06-'08) 2007 - P0032 question?

    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...
  4. ('06-'08) 2007 - O2 converter (P0420) / head gasket leak?

    Problems, Maintenance, and Warranty
    Hi my high mileage (443K km) Forester has been throwing a check engine code for a while now. Got it read and it was P0420 - Catalyst System Efficiency below Threshold, Bank 1. My mechanic just called and 1) noted the head gasket leak is much worse than previous); 2) cylinder 3 is misfiring; and...
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