06 HCH has codes: P0420- cat converter, P0304-cyl 4 missfire, P0301 cyl 1 missfire, and P0300 multiple cyl missfire, can i fix/replace cylinders and wait till 2 years for smog inspection to replace cat converter with no problems?? Car still works but struggles when electric assist is charging also leaks oil. Any advice is appriciated thanks !

 

Replace all 8 plugs with NGK or Denso OE Style plugs (Laser iridium).

 

Ok ill try that thanks !

 

Plugs are expensive. Don't cheap out.

 

I just checked all 4 plugs, they look good maybe the wires are bad? Is there a way to check?

 

You're not paying attention. Please refer to my first post - as I said, there are 8 plugs. They can look perfect and still not function. Unless you know they've been replaced in the last 60K miles WITH THE OE STYLE PLUGS, replace them.

I've encountered P030X misfire codes on 3X HCH2, and in all three cases, they needed new plugs.

 

**** honda, ok ill replace them thanks for the help

 

https://www.rockauto.com/en/catalog/...park+plug,7212

NGK 4458

There's also a Denso P/N but I can't find it on RockAuto, and I can't get to denso's site.

If you buy them locally, they're likely to run you $14 EACH

 

Thanks brotha I appreciate the advice!