What to do about a misfire and catalyst converter?

Asked by Karissa Jul 11, 2020 at 02:25 PM about the 2009 Nissan Sentra 2.0

Question type: Maintenance & Repair

I went to Napa Center to get my blinking check
engine checkers to see what's wrong. Two codes
showed up PS300 and a 420. The mechanic said
that there is a misfire which I knew already. I want
to replace all four of my ignition coils but he also
told keep to try a tune up as well. I guess I'm
wondering what part of the tune up process
should I get fixed right now and the rest later so I
can get m car back on the road driving normally?

2 Answers

F_O_R answered 4 years ago

Replace the spark plugs and replace the coils if they are bad. You want to fix the misfire before you spend big money on replacing the cats.

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James answered 4 years ago

As FOR said. Most likely the catalytic converter was ruined by the misfiring. Hope that helps! Jim

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