The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 CX-5 Rough Idle and Check Engine Light - P0301

0

Laura J. · rep 0 · May 22, 4:53 AM · 1 replies · solved · Question

My 2017 Mazda CX-5 Grand Touring, with about 70k miles, has recently started running rough, especially at idle. The check engine light came on yesterday. I scanned it and got a P0301 code, indicating a misfire on cylinder 1.

It feels like a definite misfire, and the car sometimes hesitates when accelerating from a stop. The fuel economy also seems to have dipped slightly. I'm worried about potential engine damage if I keep driving it like this.

What could be causing this, and is it a common issue for this model year? Should I try replacing the spark plugs first, or is it likely something more serious?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:53 AM

0

ClearTheCode guidance (Mazda · Buying & ownership)

Summary: For 2017 CX-5 Rough Idle and Check Engine Light - P0301, 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: My 2017 Mazda CX-5 Grand Touring, with about 70k miles, has recently started running rough, especially at idle. The check engine light came on yesterday. I scanned it and got a P0301 code, indicating a misfire on cylinder 1.

It feels like a definite misfire, and the car sometimes hesitates when accelerating from a stop. The fuel economy also seems to have dipped slightly. I'm worried about potent…

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

Menu

Help & account