64MT475M | Genuine Volvo® Air Pressure Sensor 150 PSI

The sensor reads pressure in the intake manifold. Higher pressure = more air entering the cylinders.

2. Help calculate the correct fuel amount

The ECU uses the air pressure reading to decide how much fuel to inject for proper combustion.
This keeps the air-fuel mixture balanced.

3. Improve engine performance

Correct pressure data allows:

• Smooth acceleration

• Better throttle response

• Good power under load

4. Control turbocharger boost (in turbo engines)

A boost pressure sensor prevents:

• Over-boosting (too much pressure)

• Under-boosting (too little pressure)

5. Reduce emissions

With accurate air-pressure readings, the engine burns fuel more cleanly.

6. Protect the engine

If pressure is too high or too low, the ECU can:

• Reduce power

• Adjust timing

• Prevent engine damage

7. Assist in idle stability

Keeps the engine running smoothly at low RPM by monitoring manifold pressure.

1. Poor Acceleration / Lack of Power

Wrong pressure readings cause the ECU to miscalculate fuel, leading to weak throttle response.

2. Rough Idle or Engine Stalling

Unstable or incorrect pressure data causes uneven combustion at idle.

3. Hard Starting

If the sensor shows wrong pressure during cranking, the engine may struggle to start.

4. Black Smoke from Exhaust (especially in diesel engines)

Too much fuel is injected because the ECU thinks more air is entering the engine than actually is.

5. Increased Fuel Consumption

Incorrect air-fuel mixture makes the engine run rich, burning more fuel.

6. Turbocharger Problems

For turbo-equipped engines:

• Low boost

• Overboost

• Limp mode

The ECU uses pressure readings to control turbo operation.

7. Check Engine Light (CEL)

The ECU detects abnormal manifold pressure or inconsistent readings from the MAP sensor.

8. Engine Misfiring

Wrong air pressure readings affect timing and fuel delivery.

9. Hesitation or Surging While Driving

Engine may jerk or surge due to fluctuating pressure signals.