VEHICLE SAFETY

Engine Misfire Symptoms — Rough Idle, Power Loss, and OBD Codes

Last updated: 2026-05-03 · Source: GearVerify Atlas

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CRITICAL

Can cause catalytic converter damage · Reduced engine power at highway speeds · Increased fuel consumption and emissions

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Model number

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What this recall means for you

Engine misfire occurs when one or more cylinders fail to fire properly, causing a rough idle, hesitation, loss of power, and increased emissions. Common causes include bad spark plugs, ignition coils, fuel injectors, and vacuum leaks.

What to do next

Check if the check engine light is flashing — if yes, stop driving immediately to prevent converter damage
Note which cylinder is misfiring if your scanner can identify it: Cylinder 1 misfire is usually ignition; Cylinder 4 often relates to the exhaust cam
Try swapping spark plugs between cylinders to see if the misfire moves — if it follows the plug, replace the spark plug
On direct injection engines, inspect the ignition coils for oil contamination or cracking
Check for vacuum leaks near the intake manifold — a cracked PCV hose can cause random misfires
Do not drive on a misfiring engine for extended periods — unburnt fuel entering the exhaust can overheat the catalytic converter

Recall data

Deaths Reported	None reported
Recall Date	Jan 1, 2025
Record ID	OBD-SYMPTOM-MISFIRE-001

GearVerify Atlas Recalls

This tool does not guarantee product or vehicle safety. Always verify with the official source or manufacturer. No recall match does not mean a product or vehicle is safe.

Source	nhtsa.gov
Last Updated	2026-05-03
Published	2025-01-01
Record ID	OBD-SYMPTOM-MISFIRE-001