P0304 Code: Nissan Rogue (2021-2024) - Causes, Symptoms & Fixes

Recap of data note:

• In the provided NHTSA data for Nissan Rogue (2021-2024), there is one owner complaint for P0301 (cylinder 1 misfire) and no official recalls. No recalls found in NHTSA database.

CODE MEANING AND SEVERITY

• What P0304 means: OBD-II diagnostic trouble code P0304 indicates a misfire detected in cylinder 4. The engine’s PCM monitors combustion for each cylinder; when it detects an ignition/fuel/combustion anomaly that prevents normal combustion in cylinder 4, it sets P0304 and typically illuminates the malfunction indicator light (MIL).
• Severity and impact: Moderate to high. A single or occasional misfire may be manageable, but repeated misfires can cause rough running, power loss, and increased exhaust emissions. Prolonged misfires can damage the catalytic converter and heat the misfiring cylinder, potentially leading to more extensive (and expensive) repairs.

COMMON CAUSES ON NISSAN ROGUE

Note: The Rogue in this model year range generally uses a 4-cylinder gasoline engine. The following are common causes of P0304 on Rogues:

• Worn or fouled spark plug in cylinder 4
• Faulty ignition coil or coil-on-plug for cylinder 4
• Faulty or dirty fuel injector for cylinder 4 (sticking open/closed, inadequate spray)
• Vacuum leak near cylinder 4 (intake manifold gasket, hoses)
• Low fuel pressure or restricted fuel delivery to cylinder 4
• Wiring/connector issue to cylinder 4 ignition coil or injector (corrosion, loose connection)
• Carbon buildup, incorrect valve seating or compression issue in cylinder 4
• Mass Air Flow (MAF) sensor or air intake issues causing an imbalanced air-fuel mixture
• Incorrect spark plug gap or type for cylinder 4
• Engine mechanical issue (low compression in cylinder 4 due to valve/piston/seat problems)
• PCM/ECU sensor or software anomaly (less common, but possible if updates exist)

SYMPTOMS

Typical symptoms you might notice with P0304 on a Rogue:

• Rough idle or engine shake, especially at low RPM
• Hesitation or reduced power when accelerating
• Engine runs but feels underpowered or “lugging”
• MIL (check engine light) on with P0304 stored in the ECU
• Poor fuel economy
• Possible slight exhaust odor if misfire continues and catalytic converter is affected
• Misfire may be intermittent or persistent depending on root cause

DIAGNOSTIC STEPS

Follow a methodical approach to confirm P0304 and identify the root cause. Adapt steps to your tools (OBD-II scanner, multimeter, fuel pressure gauge, stethoscope, compression tester).

Preliminary checks

• Confirm DTC and read freeze-frame data: note engine rpm, load, temperature, and short-term/long-term fuel trims at the time of misfire. This helps distinguish fueling vs. ignition vs. mechanical problems.
• Check for additional codes: P0301, P0302, P0303, P0305, P0306 (other cylinders misfiring) or P0300 (random/mmultiple misfire). If other misfires are present, broader issues (fuel system or vacuum) may be implicated.
• Inspect for obvious issues: visible leaks, damaged hoses, loose connectors, or obvious spark plug/wire damage.

Cylinder 4 ignition/ignition-system checks

• Inspect spark plug in cylinder 4:
  • Remove the ignition coil and spark plug for cylinder 4.
  • Check plug condition (deposits, fouling, correct gap). Replace if worn or fouled; ensure correct heat range.
• Inspect ignition coil for cylinder 4:
  • Visually inspect the coil for damage or cracking.
  • Compare resistance: measure primary and secondary resistances if you have the service manual specifications and a multimeter.
  • Coil swap test (swap cylinder 4 coil with cylinder 1 or another known-good cylinder):
    • If the misfire follows the coil (P030x code moves to the swapped cylinder), the coil is faulty.
    • If the misfire remains on cylinder 4, it’s likely not the coil.
  • Inspect coil boot/seal for cracks or moisture.

Fuel-injection/fueling checks

• Inspect fuel injector on cylinder 4:
  • Check electrical resistance of injector (compare to spec).
  • Listen for injector click with engine running or use a Ultrasound/modified stethoscope to verify operation.
  • Swap test: swap the cylinder 4 injector with another cylinder’s injector (if feasible) and see if the misfire code changes cylinder. If the misfire follows the injector, the injector is faulty.
  • Consider a fuel injector cleaning or replacement if sticking or insufficient spray is suspected.
• Check for fuel pressure and delivery:
  • Connect a fuel pressure gauge and verify static and running fuel pressure is within spec for the Rogue’s engine. Low pressure can cause misfires, especially under load.
  • Check for fuel filter restriction or pump issues; listen for abnormal pump behavior.
• Vacuum leaks:
  • Inspect intake manifold gasket around cylinder 4 and associated hoses for cracks or disconnections.
  • Use a spray bottle with a small amount of carb cleaner or propane around the intake manifold area while the engine is running to identify a change in RPM, indicating a vacuum leak.

Air and sensor checks

• Inspect and, if needed, clean the MAF sensor and ensure air filter is clean and properly seated.
• Check for any exhaust leaks that could affect exhaust gas composition and misfire detection.
• Check PCV system for leaks or stuck valves, which can affect cylinder balance.

Engine mechanical checks (if ignition/fuel issues are resolved with no fix)

• Perform a compression test on cylinder 4 and compare with the other cylinders.
  • Significantly lower compression indicates mechanical issues (valve seating, piston rings, head gasket, etc.).
  • If compression is normal, focus more on ignition/fuel system and seals.

ECU/vehicle health checks

• Look for any software/ECU updates or TSBs relevant to misfire issues (without citing external sources; check dealer or official Nissan service portal).
• Inspect wiring harnesses and connectors to cylinder 4 (ignition coil and injector) for corrosion, insulation wear, or loose connections.

Documentation and follow-up

• After each repair attempt, clear codes and run a drive cycle to recheck for P0304.
• If P0304 reappears after a repair, re-evaluate all steps; persistent misfires may require professional diagnosis with advanced equipment (scope tracing, injector balance testing, leak-down testing).

RELATED CODES

• P0300: Random/Multiple cylinder misfire detected
• P0301: Cylinder 1 misfire
• P0302: Cylinder 2 misfire
• P0303: Cylinder 3 misfire
• P0305: Cylinder 5 misfire (if there is a 5-cylinder engine in a variant; in a 4-cylinder Rogue, P0305/ P0306 might be irrelevant, but note that P030x family covers all cylinders)
• P0306: Cylinder 6 misfire (see note above)
• General guide: If other P030x codes appear, the misfire issue may be isolated to a single cylinder or could indicate a broader fueling/ignition problem.

REPAIR OPTIONS AND COSTS (2025 PRICES)

Prices vary by region, shop, and whether you use OEM parts. The following are rough retail ranges to give you a ballpark. All estimates assume a single-cylinder fix (cylinder 4) unless noted otherwise.

• Spark plug replacement (cylinder 4):

  • Parts: $5–$20
  • Labor: $40–$120
  • Estimated total per cylinder: $45–$140
  • If you replace all 4 plugs at once (recommended if plugs are old): Parts $20–$80; Labor $120–$260; Total $140–$340

• Ignition coil replacement (cylinder 4):

  • Parts: $40–$150
  • Labor: $60–$180
  • Estimated total per coil: $100–$330
  • If the coil is not the issue, you won’t pay these costs; if you swap tests indicate coil failure, this is the typical range.

• Fuel injector replacement (cylinder 4):

  • Parts: $60–$250
  • Labor: $150–$350
  • Estimated total: $210–$600
  • Cleaning injector (instead of replacement) can be cheaper: parts $0–$60; labor $60–$180

• Vacuum leak repair (cylinder 4 area):

  • Parts: $20–$120 (gasket, hoses)
  • Labor: $60–$200
  • Estimated total: $80–$320

• Fuel system diagnosis and testing:

  • Labor only: $60–$250 (depending on vehicle and shop)

• Compression test / mechanical issue repair:

  • Compression test: $60–$150 (labor for test)
  • If mechanical repair is needed (valve, gasket, piston rings, head work): $1,000–$4,000+ depending on extent

• ECU/Software update:

  • Software/Tag updates typically require dealer service: $0–$150 (if paid as part of a service/recall or update)

Notes and caveats

• These prices reflect typical 2025 market pricing; actual quotes vary by region, technician labor rate, and parts choice (OEM vs aftermarket).
• If multiple cylinders show misfire or the cause isn’t isolated to cylinder 4, the repair cost may be higher due to broader fuel/ignition system work or mechanical diagnosis.

DIY VS PROFESSIONAL

• DIY feasibility:
  • Spark plugs: Generally doable for a DIY with basic hand tools and torque wrench; follow Subaru-style caution (torque specs, heat range, and anti-seize where appropriate).
  • Ignition coil swap: Simple in many 4-cylinder setups; swap test can quickly identify a faulty coil.
  • Fuel injector work: Possible but more challenging; removing injectors and testing may require knowledge of fuel system safety (fuel pressure, fire risk).
  • Vacuum leaks or MAF cleaning can be DIY-friendly with caution.
• When to go pro:
  • If you do not have the tools or experience to safely perform fuel-pressure testing, compression testing, or injector diagnosis.
  • If a coil/plug swap does not resolve the issue or if the code recurs after a single-cylinder repair.
  • If you suspect mechanical issues (low compression, valve seating) or suspect ECU/software anomalies.
• Safety and warranty:
  • Always follow safety procedures for high-voltage ignition components.
  • If your vehicle is under warranty, consult the dealer for diagnostics and potential TSBs before performing repairs yourself.

PREVENTION

• Regular maintenance:
  • Replace spark plugs at the interval specified by Nissan for your engine (often every 60k–100k miles depending on plug type and driving conditions).
  • Use OEM-recommended ignition coils or high-quality aftermarket equivalents.
  • Keep the air filter clean and replace on schedule to prevent unmetered air from causing misfires.
• Fuel system care:
  • Use quality fuel; consider top-tier fuels or a fuel system cleaner occasionally if recommended by your mechanic.
  • Replace fuel filters per maintenance schedule; address fuel delivery issues promptly.
• Vacuum/PCV system:
  • Inspect PCV valves and vacuum lines for leaks and replace as needed.
• Monitoring and early action:
  • If you notice MIL coming on with P0304 or any misfire symptoms, diagnose early to prevent catalyst damage and more costly repairs.
  • Address misfire for cylinder 4 promptly, as unresolved misfires can lead to downstream catalyst deterioration and increased emissions.
• Driving habits:
  • Avoid extended periods of heavy load or high RPMs with a misfire condition, which can worsen engine damage.

Closing notes on data limitations

• The provided data set contains no P0304 complaints for the 2021-2024 Nissan Rogue, and there are no recalls in the database for this model/year in the given data. The diagnostic guidance above uses general misfire troubleshooting principles applicable to Nissan Rogue engines of this generation, plus common 4-cylinder misfire sources. If you need model-specific torque specs, wiring diagrams, or service bulletin references, consult Nissan’s official service information portal or a qualified technician.