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Re: P0300 and P0420 On my 02 TB
bmr- how many miles are on your 2002? Misfire codes really are not that common on the 4.2, especially the MAF-less 2002-2005 4.2's. Too bad you wasted the resources on a new fore and aft O2 sensor. That was a waste, especially the after cat replacement. A funky MAP or IAT sensor *could* throw your fuel trim off enough to cause a misfire, but you would likely get more codes associated with the MAP or IAT if they are bad. Have you changed spark plugs? Maybe a broken or loose coil connection? Also look/listen for a vac leak. Worst case you have a valve seating or timing issue causing a misfire. A compression test would pinpoint that.
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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