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2018 Outlander Sport Rough Idle & Check Engine Light - Misfire?

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Mike T. · rep 0 · May 22, 5:34 AM · 1 replies · solved · Question

Hey everyone, I'm having an issue with my 2018 Mitsubishi Outlander Sport SE, with about 75,000 miles on it. Lately, it's developed a really rough idle, especially when I'm stopped at a light. The engine feels like it's shaking more than usual.

To make things worse, the check engine light came on a couple of days ago. I got it scanned at a local auto parts store, and it pulled a P0302 code, indicating a misfire on cylinder 2. I'm wondering if this is something I can tackle myself, or if it's best to take it to a shop.

Could it just be spark plugs, or something more serious like an ignition coil? Any advice on diagnosing this further or what parts I might need would be greatly appreciated. I'm pretty handy but haven't done much engine work on this specific vehicle.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:34 AM

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ClearTheCode guidance (Mitsubishi · Maintenance & DIY)

Summary: For 2018 Outlander Sport Rough Idle & Check Engine Light - Misfire?, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I'm having an issue with my 2018 Mitsubishi Outlander Sport SE, with about 75,000 miles on it. Lately, it's developed a really rough idle, especially when I'm stopped at a light. The engine feels like it's shaking more than usual.

To make things worse, the check engine light came on a couple of days ago. I got it scanned at a local auto parts store, and it pulled a P0302 code, indic…

This is educational guidance, not a substitute for hands-on diagnosis.

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