Genuine Short-Reach Spark Plug Ford Focus 2005-2012 CT1E12405AA

Genuine short-reach spark plug for Ford Focus 2005-2012, CT1E12405AA is an engine ignition system component designed to create an electric spark to ignite the air-fuel mixture in the combustion chamber, helping the engine start and run smoothly.

On the Ford Focus 2005-2012, the spark plug plays an important role in ensuring engine performance, optimizing power output, reducing fuel consumption, and minimizing emissions during operation.

Over time, spark plugs can experience electrode wear, carbon buildup, or reduced ignition performance due to high temperatures and continuous combustion. When damaged, they can cause hard starting, shaking, increased fuel use, or unstable engine operation.

The genuine CT1E12405AA part is manufactured to high quality standards, ensuring stable ignition performance, durable service life, and full compatibility with the Ford Focus 2005-2012 engine.

Using a genuine spark plug helps the engine run smoothly, improves combustion efficiency, and maintains the durability of the engine system.

Product information
• Product name: Spark plug / Short-reach spark plug
• Part number: CT1E12405AA
• Brand: Genuine Ford
• Applicable vehicle line: Ford Focus
• Model year: 2005-2012
• System: Engine ignition
• Condition: New

Functions and role
• Creates a spark to ignite fuel
• Supports engine starting
• Maintains stable combustion
• Optimizes engine power
• Reduces fuel consumption and emissions

Key advantages
• Stable, precise ignition
• Genuine quality to high standards
• Good durability, high heat resistance
• OEM fit, easy to replace
• Fully compatible with the Ford Focus engine

Signs it needs replacing
• The vehicle is hard to start or starts unevenly
• The engine shakes while running
• Unusual fuel consumption
• The spark plug is worn or has carbon buildup
• The check engine light shows an ignition-related fault

👉 A spark plug is a small part, but it directly affects engine performance, so it should be replaced periodically to keep the vehicle running steadily.

Replacement recommendations
• Replace with the correct CT1E12405AA part number to ensure OEM fit
• Check the full set of spark plugs together
• Use the correct heat range for the vehicle
• Do not continue using the spark plug once it is worn
• Prioritize genuine parts for long-term durability