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 car's computer has detected a problem with the sensor that measures the air pressure difference in the engine's intake system. It's like if you had a straw with a hole in it, and it couldn't measure how much you're sucking through it properly.
The P1124 code indicates an issue with the differential pressure sensor in the intake manifold on bank 1, which is supposed to measure the pressure difference accurately. When it doesn't, the engine might not run as efficiently.
The differential pressure sensor is responsible for measuring the pressure difference across the intake manifold. This sensor's data is used by the engine control module (ECM) to optimize fuel delivery and ignition timing. An offset error means the sensor is providing inaccurate readings, which can affect engine performance.
• Check Engine Light is on
• Poor engine performance
• Reduced fuel efficiency
• Faulty differential pressure sensor
• Wiring issues or poor electrical connections
• Vacuum leaks in the intake manifold
Differential Pressure Sensor: A sensor that measures the pressure difference across two points in the engine.
Intake Manifold: A component that distributes air to the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the differential pressure sensor and its wiring for damage.
• Check for vacuum leaks in the intake manifold.
• Replace the differential pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Seal any vacuum leaks found in the intake manifold.
• OBD-II scanner
• Multimeter
• Vacuum leak detector
$150 - $400
Moderate
• Nissan Altima
• Infiniti G35
• Mazda 6
• Regularly inspect intake system components.
• Ensure all sensors are clean and functioning.
• Check for and repair vacuum leaks promptly.
Sensor Issue
• Get the vehicle inspected by a professional if the Check Engine Light is on.
• Do not ignore the issue as it may lead to reduced fuel efficiency.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been commonly reported in vehicles with aging intake systems or those that have not been maintained regularly.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a faulty sensor may lead to increased emissions, which can be illegal in some areas.
• Engine at operating temperature
• Vehicle at idle and under load
The differential pressure sensor is typically located on or near the intake manifold on bank 1.
Q: Can I drive with a P1124 code?
A: It's possible to drive, but it's not recommended as it can lead to poor fuel efficiency and potential engine damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspections of the intake system can help prevent this issue.
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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.