OBD-II Code P0107 — What It Means & How to Fix It

What Does This Error Mean?

P0107 means the Manifold Absolute Pressure (MAP) sensor is sending a voltage that's too low. The MAP sensor measures the pressure inside your engine's intake manifold. Your car's computer uses this to calculate how much fuel to inject. A low signal makes the computer think there's a strong vacuum or very little load. This leads to a lean fuel mixture, rough idle, and poor performance.

Affected Models

All vehicles 1996+
Common in Honda Civic
Common in Dodge Ram
Common in Jeep Grand Cherokee
Common in Chrysler 300

Common Causes

Faulty MAP sensor that has failed and sends incorrect voltage
Vacuum hose to the MAP sensor is cracked, disconnected, or leaking
Damaged or corroded wiring in the MAP sensor circuit
Poor electrical ground connection for the MAP sensor
Short circuit in the signal wire between the sensor and the engine computer

How to Fix It

Locate the MAP sensor on your engine. It's usually mounted on or near the intake manifold. It's a small sensor with an electrical connector and sometimes a small vacuum hose attached.

On some vehicles the MAP sensor is built into the intake manifold. Check your manual for the exact location.
Check the vacuum hose connected to the MAP sensor if your vehicle has one. Make sure it's firmly connected, not cracked, and not kinked. Replace it if it's damaged.

A cracked vacuum hose costs less than $5 and takes seconds to replace. This is the cheapest possible fix.
Unplug the MAP sensor's electrical connector and inspect it. Look for corroded pins, bent contacts, or moisture inside. Clean with electrical contact cleaner and reconnect.

Make sure the connector clicks firmly into place. A loose connection can cause intermittent low voltage readings.
Replace the MAP sensor if the hose and connector look fine. The sensor plugs in and usually has one or two small bolts. Match the replacement to your exact vehicle.

MAP sensors cost $20-$80 at auto parts stores. Installation takes about 10 minutes with basic tools.
Clear the code with an OBD-II scanner and drive the car for a few days. If the code returns, there may be a wiring issue between the sensor and the engine computer.

Borrow a free OBD-II scanner from auto parts stores like AutoZone or O'Reilly to clear codes.

When to Call a Professional

If a new MAP sensor and vacuum hose don't fix it, see a mechanic. Wiring shorts can be tricky to trace without proper tools. A mechanic can use a multimeter to test the circuit step by step. Diagnosis costs around $80-$150. MAP sensor replacement by a shop runs $100-$300 including labor.

Frequently Asked Questions

What's the difference between a MAP sensor and a MAF sensor?

A MAP sensor measures the pressure inside the intake manifold. A MAF sensor measures the volume of air flowing into the engine. Some vehicles use one or the other, some use both. They both help the computer calculate the right fuel mixture. MAP sensors are more common in older or naturally aspirated engines.

Can a vacuum leak cause P0107?

Yes, absolutely. A vacuum leak changes the pressure the MAP sensor reads. Even a small leak in the hose going to the sensor can trigger this code. Check all vacuum hoses near the intake manifold. A hissing sound while the engine runs often indicates a vacuum leak.

Is it safe to drive with P0107?

You can drive short distances, but the engine won't run correctly. The fuel mixture will be off, causing rough idle and poor acceleration. Fuel economy will suffer noticeably. In some cases the engine may stall unexpectedly. Get it diagnosed and repaired within a few days.