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P0300 Code — Meaning, Real Fixes & Costs | MyCarFault
P0300
🟠 High Engine system

P0300 — Random/Multiple Cylinder Misfire

12 Driver reports
12 Solved cases
2 Verified fixes
0 Wrong repairs reported

📊 Diagnostic Overview

Severity, cost and difficulty for P0300, based on data already on this page.

Severity
🟠 High
Diagnostic Difficulty
Not enough data yet
System
Engine
Common Causes (based on confirmed repairs)
  • P0300 = random misfire across multiple cylinders. Fix order: 1) Replace all spark plugs — most common cause, cheap fix. 2) Swap ignition coils between cylinders to find faulty coil. 3) Smoke test for vacuum leaks. 4) Fuel injector cleaner in tank. 5) Chec 1 vehicle
  • Replaced all spark plugs with NGK iridium plugs. One coil pack was also weak — replaced. Smooth idle restored immediately. 226 vehicles

📐 Diagnostic Difficulty reflects how many different repairs drivers have tried for P0300 and how often those attempts turned out to be the wrong fix — it is calculated from MyCarFault's own reports, not an official manufacturer rating.

⭐ MOST VERIFIED FIX FOR P0300
P0300 = random misfire across multiple cylinders. Fix order: 1) Replace all spark plugs — most common cause, cheap fix. 2) Swap ignition coils between cylinders to find faulty coil. 3) Smoke test for vacuum leaks. 4) Fuel injector cleaner in tank. 5) Chec
Worked in 0% of voted outcomes · Verified by 0 drivers
⚪ Unverified

Most Verified Fixes for P0300

Ranked by confidence score — same vehicle matches weighted higher.

P0300 = random misfire across multiple cylinders. Fix order: 1) Replace all spark plugs — most common cause, cheap fix. 2) Swap ignition coils between cylinders to find faulty coil. 3) Smoke test for vacuum leaks. 4) Fuel injector cleaner in tank. 5) Chec 0%
0 worked · 1 total votes · ⚪ Unverified
Replaced all spark plugs with NGK iridium plugs. One coil pack was also weak — replaced. Smooth idle restored immediately. 226 cases
No repair votes yet · 226 vehicles · ⚪ Unverified

Driver Reports — P0300 12 reports

🟢 SOLVED 80% Volkswagen Polo 2022 P0300 random misfire rough idle
Volkswagen Polo 2022 👁 2,561
🟢 SOLVED 80% Chevrolet Suburban 2014 P0300 random misfire rough idle
2014 👁 2,560
🟢 SOLVED 80% Honda Insight 2018 P0300 random misfire rough idle
Honda 2018 👁 2,533
🟢 SOLVED 80% Volkswagen Arteon 2012 P0300 random misfire rough idle
Volkswagen 2012 👁 2,521
🟢 SOLVED 80% Dodge Journey 2012 P0300 random misfire rough idle
2012 👁 2,515
🟢 SOLVED 80% Land Rover Discovery 2015 P0300 random misfire rough idle
Land Rover Discovery 2015 👁 2,507
🟢 SOLVED 80% Volvo S90 2018 P0300 random misfire rough idle
Volvo S90 2018 👁 2,501
🟢 SOLVED 80% Hyundai Kona 2015 P0300 random misfire rough idle
Hyundai Kona 2015 👁 2,501
🟢 SOLVED 80% Toyota Venza 2015 P0300 random misfire rough idle
Toyota 2015 👁 2,487
🟢 SOLVED 80% Nissan Murano 2016 P0300 random misfire rough idle
Nissan 2016 👁 2,477
🟢 SOLVED 80% Mercedes-Benz E-Class 2022 P0300 random misfire rough idle
Mercedes-Benz E-Class 2022 👁 2,474
🟢 SOLVED 80% Chevrolet Blazer 2012 P0300 random misfire rough idle
2012 👁 2,459

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