My catalytic converter is haveing 'sputering problems" my dealer says it is covered by the factory. But when i bought it about a year ago the 2004 wrangler was modified with a welded skid plate and a modifyed ex. Dealer says it will not pay for having a welding shop take off skid plate and catalytic converter. if the cat converter is covered by factory warrenty, should they not pay for getting to it??

Buy new car cats are not cheap.

Hello: Code P0 420 indicates the catalytic converter is operating below calibrated efficiency (below 60%) replacing the oxygen sensors will not correct the condition. The converter needs to be replaced and the code cleared.

The mechanic is yanking your chain and the following links will explain why cats fail http://www.ebay.co.uk/gds/Reasons-for-catalytic-converter-failure-/10000000002803746/g.html
Audi A4 catalytic converter CHECK FOR PROBLEMS your mechanic can replace cats every couple of weeks or months depending on your driving style or he can repair the faults causing the cats to fail

I would suggest checking with dealer as most KIAs have a 100,000 mile warranty and catalytic converter as part of the emissions equipment should be covered.

You know there is an 8 year 80,000 mile requirement under Federal Law.
If you call a dealer, they can tell you if Chevrolet has anything beyond that.
Google "8-80 catalytic converter"

PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

Yes, Have the dealer check and verify before buying one. Make sure all is good, that nothing is "killing" your converter.

All catalytic converters have a life time warranty, however, a shop will charge you $200 per converter or more, depending on how many are on the vehicle. Had to replace 4 on my 1996 mercury. If you have access to a cutting torch its easy to remove the converters and to replace. May want to rent one if you intent to do the job yourself. However, doing the job yourself may void the warrant on any more converters.

dearship parts are high.you can buy a factory catalytic converter or universal converter cheaper at auto parts place.they basic the same parts the.dealership has same catalytic converter.they put their price and labor rate charge an hour your pocket book will be empty.i have used universal catalytic converter.had no problem with it.the only difference is universal converter body a little shorter.but has same lengh as factory.if check engine is coming on you cant turn it off .if computer showing you a code.you could have a misfire causing rich exhaust emission.that can ruin a catalytic converter have it scan.dealership charge you about $130.00 .you can have it scan at advance auto or auto zone.to see what pcm code is.it could be oxygen sensor somethinh minor.

OK Thad code PO136 is your oxygen sensor the one before the catalytic converter and yes if your you bought your car brand new
from the dealer ship yes you are covered by the factory warranty
but if you got it from a used car dealer then you are not.

If you are not covered the good news is than that is not so hard to change.
all you need is a jack a oxygen sensor tool ( you can get it as a loaner on Auto Zone no charge ) and a new oxygen sensor.

If you don't know how a catalytic converter looks like click this link
good luck.
http://cgi.ebay.com/ebaymotors/2002-TOYOTA-TACOMA-MAGNAFLOW-CATALYTIC-CONVERTER-23759_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1116QQhashZitem3a4ae004b7QQitemZ250364298423QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories#ebayphotohosting