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CarCodeFix
P0305Critical Priority

Cylinder 5 Misfire Detected

Category: Powertrain• Ignition System / Misfire

39 articles · 8 makes affected

What is P0305?

P0305 is a critical powertrain code indicating the engine's computer has detected a misfire specifically in cylinder 5. This means the air-fuel mixture in that cylinder is not burning properly, which can damage the catalytic converter and other components if driven for long. Based on real owner data, this code is most frequently reported in Ford Mustangs, Acura TLs, and Jeep Wranglers.

Common Causes

  • ●Faulty spark plugs or ignition coils (commonly mentioned in owner maintenance discussions)
  • ●Fuel delivery issues to cylinder 5
  • ●Mechanical engine problems like low compression

Symptoms You May Notice

  • ●Check Engine Light is illuminated
  • ●Engine runs rough, shakes, or lacks power
  • ●Poor fuel economy and increased emissions

How to Fix It

  • ●Replace spark plugs and ignition coils for cylinder 5 ($100-$400, moderate difficulty)
  • ●Diagnose and repair fuel injector or fuel delivery issues ($150-$800, moderate difficulty)
  • ●Perform engine compression test and address mechanical failures (cost varies widely, high difficulty)

Owner Statistics

Based on 417,064 real owner discussions • 11540 confirmed solutions

Dataset (417,064 records)
$2,157
Average Repair Cost
3%
Success Rate
21%
DIY Repairs
417,055
Data Sources

About This Data

Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.

Frequently Appears With

These codes often appear together in owner reports. Check these if you see P0305.

Based on analysis of 24 owner reports where multiple codes appeared together.

Issues by Vehicle

FORD

2020 Mustang

2020 Ford Mustang Overheating: Troubleshooting and Repair Guide

213 sources
2020 Mustang

2020 Ford Mustang: What Causes Valve Cover Smoke?

143 sources
2010 Mustang

How to Replace Spark Plugs on Your 2010 Ford Mustang

66 sources
2020 Mustang

How to Fix Stuttering and Hesitation in Your 2020 Ford Mustang (Fuel Injector Guide)

308 sources
2020 Mustang

Why Are Your 2020 Ford Mustang Spark Plugs Fowling?

108 sources
2020 Mustang

Stop Your Mustang's Oil Leak: The Real PCV System Fix

345 sources
2020 Mustang

Ignition Coil Issue Issues on the 2020 Ford Mustang: What Owners Report

132 sources
2020 Mustang

Why Your 2020 Mustang is Overheating and Pushing Out Coolant

104 sources
2010 F-150

How to Diagnose and Fix Your 2010 F-150's Rough Idle and Fuel Issues

59 sources
2010 Expedition

How to Diagnose and Fix a Coolant Leak in Your Ford Expedition

250 sources
2010 Expedition

How to Diagnose and Fix a Blown Fuse in Your Ford Expedition

95 sources
2020 F-150

Why Your 2020 F-150 ABS Light Is On (And How to Turn It Off)

451 sources
2010 Ranger

Why Your 2010 Ford Ranger is Misfiring and How to Fix It

78 sources
2010 Ranger

Why Your Ford Ranger Is Pulling and Losing Power (And How to Fix It)

95 sources
2020 F-150

Why Your 2020 F-150 Won't Shift Gears (And How to Fix It)

494 sources
2020 Expedition

Why Your Ford Expedition Steering Wheel Shakes (And the Simple Fix Owners Use)

1.1K sources
2015 F-150

How 2015 F-150 Owners Fixed Their Turbo Coolant Line Leaks

46 sources
2020 Mustang

Stopping Your Mustang's Oil Leak: A 2020 Owner's Repair Guide

2.0K sources