✅ Fixed
Swapped coil pack cylinder 3 to cylinder 1. Code moved to P0301. Bad coil confirmed. Replaced all 4 coil packs $140. No misfires since.
Hyundai Elantra 2016 P0303 cylinder 3 misfire
⚡ Quick Summary
Severity Level
High
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Can become a safety issue if left unresolved
Urgency Level
🟠 Fix Soon
P0303 misfire cylinder 3. Slight rough idle. Check engine on. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.
🔍 Symptoms
📍 Hyundai Elantra
⚠️ P0303 fault code
⚙️ Possible Causes
Fault code P0303 detected
Hyundai Elantra
Possible: Swapped coil pack cylinder 3 to cylinder 1. Code moved to P0301. Bad coil confirmed. Replaced all 4 coil packs $140. No misfires since.
Repair / Solution
Based on 54 driver confirmations
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Hyundai Elantra 2016 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🧾 Driver Reports
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