Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that there's a problem with how long it takes for the fuel injector in cylinder 11 to do its job. It's like when a water gun doesn't squirt water fast enough or at the right time.
This code indicates that the injector for cylinder 11 is not performing as expected in terms of timing, which can affect engine performance.
The P3143 code is triggered when the Engine Control Module (ECM) detects that the low side booster time for the high-pressure injector in cylinder 11 is not within the expected range. This could be due to electrical issues, mechanical failure, or fuel delivery problems.
• Engine misfire
• Poor fuel economy
• Check Engine Light illuminated
• Faulty fuel injector
• Wiring issues in the injector circuit
• Fuel pressure problems
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for cylinder 11's injector.
• Test the fuel injector for proper operation.
• Replace the faulty injector.
• Repair or replace damaged wiring.
• Check and adjust fuel pressure if necessary.
• OBD-II scanner
• Multimeter
• Fuel pressure gauge
$200 - $500
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regular maintenance of fuel system
• Use quality fuel
• Inspect wiring regularly
Engine Performance
• Have the issue diagnosed by a professional mechanic.
• Avoid driving the vehicle if performance issues are severe.
Check with the vehicle manufacturer for specific warranty coverage on injectors.
This code has been associated with high-performance engines that use direct injection systems.
Moderate – Should be addressed soon to avoid further engine performance issues.
Driving with a malfunctioning injector can lead to increased emissions and possible engine damage.
• Engine at operating temperature
• Vehicle in idle
The fuel injector for cylinder 11 is located on the engine block, typically near the intake manifold.
Q: Can I drive with a P3143 code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How can I prevent injector issues?
A: Regular maintenance and using quality fuel can help prevent injector problems.
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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.