P0105: Manifold absolute pressure (MAP) sensor circuit fault

What P0105 means

The MAP sensor measures pressure (or vacuum) inside the intake manifold, and the ECU uses it to work out engine load and fuelling. On some cars the same circuit covers barometric pressure. This code points to a general circuit fault: the signal is missing or makes no sense.

Most common causes

• Loose or corroded MAP sensor connector
• Broken or chafed sensor wire
• Vacuum hose to the sensor loose or split
• A faulty MAP sensor
• Missing reference supply (usually 5 volts) from the ECU to the sensor

Symptoms

• Engine warning light on
• Loss of power or sluggish response
• Rough idle
• Higher fuel consumption or black smoke on diesels

Can you drive with P0105?

With care You can drive, but the ECU is using backup values and the engine may feel flat and use more fuel. Get it fixed soon.

How to check it

With the ignition on and the engine off, manifold pressure in live data should be close to atmospheric (about 100 kPa at sea level, a little less at altitude). It should drop once the engine starts. If it does not move, suspect the sensor or its wiring.

How to read and clear P0105 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0105 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

• P0101 Air flow sensor range or performance problem
• P0102 Air flow sensor circuit low input
• P0103 Air flow sensor circuit high input
• P0104 Air flow sensor circuit intermittent
• P0106 Manifold absolute pressure (MAP) sensor range or performance
• P0107 Manifold absolute pressure (MAP) sensor circuit low
• P0108 Manifold absolute pressure (MAP) sensor circuit high
• P0109 Manifold absolute pressure (MAP) sensor circuit intermittent
• P0100 Mass or volume air flow sensor circuit fault
• P0110 Intake air temperature sensor circuit fault
• P0111 Intake air temperature sensor range or performance
• P0112 Intake air temperature sensor circuit low

P0105 is a generic code, so it means the same on any make, for example on Audi, Fiat, Mazda, Opel / Vauxhall, Peugeot, Toyota. See what Final OBD does on your car in makes and models.