Question about 2003 Mitsubishi Lancer
I can see that you've done the right things, but something is still amiss... Mitsubishi says
A code P0421 may mean that one or more of the following has happened:
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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