P0106Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The manifold absolute pressure (MAP) sensor measures the pressure behind the throttle; on vehicles without a separate barometric sensor it also supplies the ambient pressure, read at key-on or wide-open throttle – hence 'MAP/BARO'. It is a three-wire sensor with 5 V reference, ground and signal. P0106 is a plausibility fault: the signal is electrically valid but implausible – stuck, offset or drifting. Two tests are common. With the engine stopped, all pressures equalise, so MAP must match ambient (and boost) pressure; Ford allows 1.5–3 inHg. While running, MAP is compared with a value modelled from air mass, throttle and speed – GM blames the MAP sensor above about 23–30 kPa error, with two trips on petrol and one on diesel. Turbo engines with three sensors find the odd one out by majority. Besides the sensor, intake or boost leaks often cause it.
- What you may notice
- Check engine light on
- Rough idle, hesitation, poor response
- Higher consumption, black smoke possible on diesels
- Loss of power or limp mode on turbo engines
- Likely causes
- LikelyVacuum leak at the intake manifold or boost leak (hose, clamp, charge air cooler)
- LikelySensor oiled or sooted, port blocked (EGR soot), characteristic drifted
- PossibleHigh resistance in signal, reference or ground wire
- PossibleComparison sensor wrong, or mechanical cause (dirty throttle, EGR stuck open)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.