Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that when the car is starting, one of the parts that makes the engine run smoothly isn't working right in cylinder number 9. It's like trying to ride a bike with one flat tire.
The engine control module (ECM) has detected a misfire in cylinder 9 during engine start-up.
A misfire in cylinder 9 during the start phase indicates that the air-fuel mixture in that cylinder isn't being ignited properly. This can be due to issues with the spark plug, ignition coil, or fuel injector specific to cylinder 9.
• Rough engine start
• Check Engine Light illuminated
• Reduced engine performance
• Faulty spark plug in cylinder 9
• Defective ignition coil for cylinder 9
• Clogged or faulty fuel injector in cylinder 9
ECM: Engine Control Module
Misfire: Failure of the air-fuel mixture in a cylinder to ignite properly
• Check the spark plug in cylinder 9 for wear or damage.
• Test the ignition coil for cylinder 9.
• Inspect the fuel injector for cylinder 9 for clogs or faults.
• Replace the spark plug in cylinder 9.
• Replace the ignition coil for cylinder 9.
• Clean or replace the fuel injector for cylinder 9.
• OBD-II scanner
• Spark plug socket
• Multimeter
$150 - $400
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regularly replace spark plugs as per manufacturer recommendations.
• Use high-quality fuel to prevent injector clogging.
• Perform regular engine maintenance checks.
Engine Performance
• Avoid driving the vehicle if the engine is running rough.
• Seek professional diagnostic and repair services promptly.
Check with the vehicle manufacturer for warranty coverage on ignition components.
Misfire codes have been common in vehicles with high mileage or insufficient maintenance.
Moderate – Should be addressed soon to prevent further engine damage.
Driving with a misfire can lead to increased emissions and potential engine damage.
• Cold engine start
• Normal operating temperature
Cylinder 9 is typically located on the engine block, depending on the engine configuration.
Q: What happens if I ignore a misfire?
A: Ignoring a misfire can lead to more serious engine damage and increased repair costs.
Q: Can I drive with a misfire in cylinder 9?
A: It's not recommended to drive with a misfire as it can cause further damage to the engine.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.