MAP sensor voltage exceeds the maximum threshold (typically above 4.5 V). The ECU interprets abnormally high manifold pressure, causing errors in engine load calculation.
Common causes
Open ground circuit at the MAP sensor
Short to Vref (5 V) in the signal wire
Sensor failure with output stuck high
Disconnected vacuum hose causing open-air reading on some sensor designs
Symptoms
MIL illuminated
ECU interprets low vacuum/high load condition
Lean correction or over-fuelling
Hesitation
Severity
Moderate severity: same consequence as P0107 but in the opposite direction — incorrect fuelling increases emissions and reduces driveability.