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 a sensor in the car isn't getting the right air pressure reading from the engine. It's like when you try to blow up a balloon, but not enough air is going in.
The differential pressure sensor is detecting a lower than expected pressure in the intake manifold of the engine.
The P1104 code indicates that the differential pressure sensor is reading a pressure level in the intake manifold that is lower than the manufacturer's specified range. This sensor helps monitor the air pressure entering the engine, which is crucial for optimal combustion and engine performance.
• Check Engine Light illuminated
• Reduced engine performance
• Poor fuel economy
• Faulty differential pressure sensor
• Vacuum leak in the intake manifold
• Blocked or restricted air intake
Differential Pressure Sensor: A device that measures the difference in pressure between two points.
Intake Manifold: A component that distributes air to the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the intake manifold for vacuum leaks.
• Test the differential pressure sensor using a multimeter.
• Replace the faulty differential pressure sensor.
• Repair any vacuum leaks in the intake manifold.
• Clean or replace a blocked air intake filter.
• OBD-II scanner
• Multimeter
• Vacuum leak detector
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regular maintenance of the air intake system
• Periodic inspection of the intake manifold
• Ensure timely replacement of air filters
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if you're unsure.
Check if the vehicle is under warranty for emissions-related components.
This code has been associated with issues in vehicles with turbocharged engines where intake pressure is critical.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with this code can lead to increased emissions and may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle at idle
The differential pressure sensor is typically located near the intake manifold on the engine.
Q: Can I drive with a P1104 code?
A: It's not recommended as it can lead to poor engine performance and increased emissions.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspection of the intake system can help prevent this issue.
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An app-based scanner with repair reports and enhanced system diagnostics on supported vehicles.
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Specialty · Fuel pressure tester
Helpful for no-start, lean, rich, injector, and fuel-delivery diagnosis.
Useful for checking whether fuel delivery is contributing to the fault.
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Specialty · Compression tester
Useful when misfire, mechanical condition, or low-cylinder-pressure problems are suspected.
Helpful when you need to rule out low compression or mechanical engine problems.
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