P0105 Manifold absolute pressure / barometric pressure sensor circuit
What P0105 means
The engine computer has a problem with the signal from the manifold absolute pressure (MAP) sensor, which measures pressure or vacuum in the intake manifold. The computer uses this to calculate engine load, so a bad signal upsets fuelling and ignition timing.
P0105 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- High
- Typical repair cost
- 50–250 €
- Workshop time
- 0.3–1 h
- Repair difficulty
- Easy
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Rough running or hesitation
- Poor fuel economy
- Hard starting
- Black smoke or reduced power on diesels
Common causes
- Failed MAP sensor
- Damaged wiring or corroded connector
- Cracked, blocked or disconnected vacuum hose to the sensor
- Problem in the shared 5 V sensor reference circuit
Can I keep driving with P0105?
Get it to a workshop within a few days. The engine works with estimated load values, so it runs less efficiently and may hesitate or run rich.
What to check first
- Inspect the MAP sensor connector and wiring, and the vacuum hose to the sensor if it has one.
- With the key on and engine off, check that the MAP reading is close to the local barometric pressure.
- Check the 5 V reference, ground and signal at the connector; note any other sensor codes that point to a shared reference fault.
- Replace the MAP sensor if the wiring and hose are good but the signal is missing or implausible.
Related codes
- P0104 Mass air flow sensor A circuit intermittent
- P0106 Manifold absolute pressure / barometric pressure sensor range/performance
- P0103 Mass air flow sensor A circuit high
- P0107 Manifold absolute pressure / barometric pressure sensor circuit low
- P0102 Mass air flow (MAF) sensor A circuit low
- P0108 Manifold absolute pressure / barometric pressure sensor circuit high
- P0101 Mass air flow sensor A range/performance
- P0100 Mass air flow sensor A circuit
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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