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2020 Rogue S Misfiring and Rough Idle - CEL On!

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Mike T. · rep 0 · May 25, 1:54 AM · 1 replies · solved · Question

Vehicle: 2020 Nissan Rogue S

My 2020 Nissan Rogue S, with around 45,000 miles, just started acting up. The engine has a really rough idle, and I can feel it shaking more than usual. The check engine light came on yesterday and it's staying on.

When I try to accelerate, it feels sluggish, almost like it's struggling for power. I also noticed a slight decrease in my fuel economy over the last week. I'm worried it might be something serious. Any ideas what could cause a misfire in a relatively new car?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:54 AM

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  1. Initial Diagnosis: A rough idle, sluggish acceleration, and an illuminated Check Engine Light (CEL) often point to an engine misfire. The decrease in fuel economy further supports this.
  2. Common Causes:
    • Spark Plugs: Worn, fouled, or incorrectly gapped spark plugs are a very common cause of misfires. Even at 45,000 miles, depending on driving conditions, they could be a culprit.
    • Ignition Coils: A failing ignition coil on one or more cylinders can prevent the spark plug from firing correctly, leading to a misfire.
    • Fuel Injectors: Clogged or faulty fuel injectors can disrupt the fuel-air mixture, causing a misfire.
    • Vacuum Leaks: Leaks in the intake manifold or vacuum lines can introduce unmetered air, leaning out the mixture and causing misfires.
    • Mass Air Flow (MAF) Sensor: A dirty or faulty MAF sensor can send incorrect air intake readings to the engine control unit (ECU), leading to an improper fuel mixture.
  3. When to See a Shop:
    • Immediate Scan: The first step is to get the OBD-II codes read from your 2020 Rogue. A misfire will typically trigger a P030X code (e.g., P0301 for cylinder 1, P0302 for cylinder 2, etc.) and potentially a P0300 for a random/multiple misfire. This code will help pinpoint the problematic cylinder.
    • Professional Inspection: Take your vehicle to a mechanic. They will use the OBD-II codes to guide their diagnosis. They can test spark plugs, ignition coils, and fuel injectors on the affected cylinder(s).
    • Further Diagnostics: If the basic components check out, they may investigate vacuum leaks, MAF sensor readings, or compression issues. Driving with a persistent misfire can lead to catalytic converter damage due to unburnt fuel entering the exhaust, so prompt attention is crucial.
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