OBD Code P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

Q: What are the symptoms of fault code P0107?

Check Engine Light illuminated, Rough idle or stalling at stops, Poor fuel economy and black smoke from exhaust

Q: How do I fix OBD fault code P0107?

Inspect and replace any cracked, loose, or disconnected vacuum lines connected to the MAP sensor and intake manifold.. Reseat the electrical connector at the MAP sensor and check for corrosion or bent pins.. Replace the MAP sensor if voltage remains low after vacuum and connector checks pass.

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What This Actually Means

In plain language — no jargon

The MAP (Manifold Absolute Pressure) sensor is sending a voltage signal that's too low, telling the engine computer the intake pressure is abnormally low. Think of it like a tire pressure gauge stuck on 'empty' even though the tire is fine—the ECU gets confused and runs too rich.

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Symptoms You May Notice

3 known symptoms for this code

Check Engine Light illuminated

Rough idle or stalling at stops

Poor fuel economy and black smoke from exhaust

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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The MAP sensor converts intake manifold absolute pressure into a voltage signal (typically 0.5–4.5V). The ECM expects this voltage to fall within a normal operating range based on engine load and altitude. A reading below ~0.25V for extended periods triggers P0107, indicating either a sensor failure, wiring short, or vacuum leak at the sensor.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
MAP Sensor Voltage	0.5–4.5V (varies with load)	<0.25V or open circuit
Manifold Pressure	10–100 kPa (depending on conditions)	<5 kPa sustained

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Vacuum hoses

Inspect and replace any cracked, loose, or disconnected vacuum lines connected to the MAP sensor and intake manifold.

2

MAP sensor connector

Reseat the electrical connector at the MAP sensor and check for corrosion or bent pins.

3

MAP sensor

Replace the MAP sensor if voltage remains low after vacuum and connector checks pass.

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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code P0107 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.

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How to Clear Code P0107

What happens after you fix the fault

Once the fault is repaired, P0107 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When

Fault has been diagnosed and repaired
You want to confirm the repair worked
Code appeared after a sensor was cleaned

⚠️ Do Not Clear When

Preparing for an emissions/PUC test
Root cause is still undiagnosed
Check engine light is flashing

Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.