Question about 2006 Ford Focus
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Posted on Jan 02, 2017
no a dealer is not the only place that replaces these; you can do it yourself and there should be 2 of them. most of them are replaced with aftermarket ones. go to a muffler shop and they will replace them for you and you can check at an Autozone or Napa for the catalytic converters
Posted on Apr 05, 2009
If you have more than 60K miles start by replacing the Oxygen sensor(s) that is(are) installed after the catalytic converter(s).
P0421: Warm up catalyst efficiency below threshold. This code means that the computer is detecting the catalyst not warming up to full function quickly enough based on information from the post cat O2 sensor.
Good luck and hope this helps.
Posted on Aug 21, 2009
If you don't have poor gas milage and loss of power, the cat is not restricted and not at fault, however, an engine misfire can also trigger that code.
Change the 02 sensor down by the cat first,( it's cheaper than a cat), see if that clears the code, if not, then go for the cat. You will already have a new 02 sensor, so that will eliminate those two. Hope this helped.
Posted on Mar 04, 2010
SOURCE: 2005 Ford Focus flex pipe repair
Advance auto and auto zone sell just the flex pipe. You will need to have someone cut the old one out and weld the new one in. costs about $20 for part vs $300 for pipew/catalitic converter attached.
Posted on May 02, 2010
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