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Old 11-22-2009, 09:37 PM   #1
Scooby Newbie
Member#: 35041
Join Date: Apr 2003
Default 2003 Subaru Legacy - CEL Codes P0301 & P0302

Background: I just moved from NC to CO and have a 2003 Legacy L wagon w/ 112.5K miles on it. Upon moving to CO (2 weeks ago) I started using 85 octane gas (which everybody tells me is OK due to the high altitude). Today I got a CEL, and had the local parts place scan it. The result: P0301 & P0302 - misfires in cylinders 1 & 2.

I haven't noticed that it runs rough or runs rough, but I think I can smell a little unburned fuel in the exhaust (not overwhelming, but it does smell like gasoline).

My plan:
1) I'm nearly out of gas. Fill up the next tank w/ 87 (or higher) and hope it goes away
2) I need plugs & wires at 120K anyway, so I'll probably change those out too (with OEM parts).

Hopefully these two things will fix it, but if not, what's the worst case scenario?


Ted C.
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Old 11-22-2009, 09:50 PM   #2
Scooby Newbie
Member#: 230758
Join Date: Nov 2009
Location: Janesville, WI
2000 Legacy Wagon
Timberland Green


I had misfire codes cause the previous owner had almost 50k on copper plugs. I changed them out and all was well. if you are due for a plug change I would think about changing them.
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Old 11-23-2009, 08:56 PM   #3
Scooby Specialist
Member#: 38222
Join Date: Jun 2003
Chapter/Region: Tri-State
Location: Cicero, NY
'10 &'12 Foresters
another Miata convert


Possible aging coilpack? There are probably 3 10mm bolts holding it on. Look at the bottom to see if it's cracked.

If you need one, shout - of three Subarus I currently own, none uses these my-old-Legacy style coilpacks I have in the basement.
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