subiada

I tend to agree with the bad converter diagnosis. I was looking at the converters together with the machanic and I don't see the shields being loose anywhere. The rattle appeared after I've been sporadically getting and clearing the error already but the frequency increased dramatically after it started. Prior to that, however, I'd noticed that it usually happens after an oil change or after pumping gas. There are no ehaust leaks that can be detected, by a manual inspections at at least.

I have an 04 Legacy approaching 200K that I intend to keep as a commuter car. About six months ago it started throwing a P0420 that I would normally clear and keep driving. I suppose the car is made to comply with CA emissions standards - it has dual front catalytic converters and the error description explicitly mentiones 'bank 1'. (http://www.justanswer.com/subaru/5qgxl-subaru-legacy-2004-subaru-legacy-35th-anniversary.html) Lately some rattling appeared from the passenger side coverterter and the error will pop up almost immediately after I clear it. I took it to a mechanic who says that it's a bad cat and I was quoted at $900 for replacement of just the passenger side one. I declined and aggreed on a three-step flush as a first measure, which did not help. The question is - what would be the cheapest way to fix this? I was able to find these parts online: This seems to be the correct part but rather expensive: http://subarupartsforyou.com/cp_partdetail.php?partid=11285 Here's another option but no CA complience: http://www.converterwarehouse.com/catalytic_converters/converter_detail.cfm?productID=259778 And this is the cheapest one: http://www.jcwhitney.com/eastern-direct-fit-catalytic-converter-49-state-legal-no-ca-shipment/p3040064.jcwx?filterid=d1939y2004g633j1&skuId=4362464 Will the latter two cause any problems? Can I reuse the old sensors? Thanks!