Fuel and air
P0129 Manifold/barometric pressure sensor: too low
P0129 means: Manifold/barometric pressure sensor: too low. The MAP sensor measures pressure in the intake manifold, which tells the computer the engine load. Drive gently and have the car checked soon. The most common repair costs about €80–160 in Estonia, depending on make and model.
Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Sensor replacement€80–160parts and labour in Estonia, depending on make and model
What it means
The MAP sensor measures pressure in the intake manifold, which tells the computer the engine load. On turbo engines a similar sensor also reads boost pressure.
What you may notice
- Engine light on
- Less power
- Higher fuel consumption
- Rough idle
What could be wrong
- 1Sensor coated in oily grime or faulty · Sensor replacement €80–160
- 2Sensor vacuum hose loose or cracked · Vacuum hose or actuator replacement €60–120
- 3Air leak in the intake · Leak check and hose or gasket replacement €60–120
- 4Wire or connector · Wiring or connector repair €45–90
Repair difficulty: Easy
What you can check yourself
Check that the sensor hose (if fitted) is intact and on tight. The sensor can often be cleaned carefully. You can do the simpler checks yourself.
How we fix it
- We read the sensor on the diagnostic tool and compare it with other sensors
- We check the connector, supply and ground
- We repair the wiring or replace the sensor
Standard SAE description: Barometric Pressure Too Low