Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the spark plug in cylinder number 11 isn't sparking for as long as it should. It's like when you try to light a candle and the match doesn't stay lit long enough.
The engine control module (ECM) is detecting that the spark duration for cylinder 11 is shorter than expected, which can affect engine performance.
The P1311 code is triggered when the ECM detects that the spark duration for cylinder 11 is shorter than the manufacturer's specified time. This could be due to issues with the ignition coil, spark plug, or related wiring.
• Engine misfire
• Rough idling
• Reduced engine performance
• Faulty ignition coil
• Worn or damaged spark plug
• Faulty spark plug wire or connector
ECM: Engine Control Module
Ignition Coil: A component that transforms the battery's voltage into a higher voltage needed to create a spark in the spark plugs.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and spark plug for cylinder 11.
• Check the wiring and connectors for damage or corrosion.
• Replace the ignition coil for cylinder 11.
• Replace the spark plug for cylinder 11.
• Repair or replace damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regularly replace spark plugs as per the maintenance schedule.
• Inspect ignition coils during routine maintenance.
• Ensure wiring and connectors are clean and secure.
Engine Performance
• Do not ignore the check engine light.
• Have the vehicle inspected by a professional if unsure.
• Perform regular maintenance to avoid such issues.
Repairs may be covered under the vehicle's powertrain warranty if applicable.
This code has been associated with ignition system issues in high-performance engines that use multiple cylinders.
Moderate – Should be addressed soon to prevent further engine damage.
Driving with this issue can lead to increased emissions and may not pass emissions testing.
• Engine at operating temperature
• Vehicle idling or under load
The ignition coil and spark plug for cylinder 11 are located on the engine, typically towards the rear in V-type engines.
Q: Can I drive with a P1311 code?
A: It's not recommended to drive for long with this code, as it can cause engine damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance and timely replacement of spark plugs and ignition coils can help prevent this issue.
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Universal · Digital multimeter
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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.