Which codes should I pay attention to? Read codes or Test Codes with green plug connected? I get p0170 p0302 p0303 in Read and I get p0500 p1101 in Test mode?


Asked by Jul 29, 2016 at 10:30 AM about the 1996 Subaru Impreza 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

1996 Subaru Impreza runs rough and bogges down going up hill.

5 Answers


Have you googled each individual code? That's the best place to start.

Tom Demyan

P0302 and P0303 are cylinder misfire codes, #2 and #3. How old the spark plug and wires. Replace those first. Check your air filter and clean MAF.



6 out of 6 people think this is helpful.

thanks for the answers. Have replaced plugs, wires, coils. Engine has good compression (225). But was interested in the priority of trouble shooting a problem. Should I use the read codes as a priority or the test codes? P0500 refers to a VSS problem and p1101 refers to a neutral safety switch issue. Misfire codes I can't figure out. Can't find air leakes, fuel pressure good, Car dies when going up hills and runs rough so I am starting to feel it is the CAT causing this problem. Any opinions? Sorry for my late response.


"Read" codes first.

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