Fault code 290900 air system air to EGR air mass flow, plausibility measure air mass compared with calculated air mass too high is related to the Problem with air intake into combustion engine through air filter. There is a sensor after air filter at the intake pipe known as air mass sensor. Air mass sensor sens amount of air entering into combustion engine and send this signal to engine control module according to which engine control module fire fuel into combustion engine. When there is more amount of air entering into combustion engine which are not calculated by air mass sensor than it can be possible that engine control module set fault code 290900 air system, air to EGR air mass flow plausibility measure air mass compared with calculated air mass too high store in engine control module.
There is only one way of air entering into combustion engine that is from intake manifold. There might be two reasons behind this fault code store in engine control module. first one is air intake pipe can be damage or leak after air mass sensor due to which air mass sensor is not able to calculate that air which are entering from that leak air intake pipe after air mass sensor. Second thing is that for this problem is faulty air mass sensor which is not working properly to calculate amount of air entering into combustion engine.
Also there could be the problem of faulty manifold absolute pressure sensor. Air mass sensor and manifold absolute pressure sensor are connect to each other. Air mass sensor measure amount of air entering into combustion engine, manifold absolute pressure sensor calculate pressure of air entering into combustion engine. It can be possible that a faulty manifold absolute pressure sensor can disturb the signal of air mass sensor. Or there is a heavy amount of carbon deposit on manifold absolute pressure or at air mass sensor due to which sensor does not work properly. The other thing which could be the reason behind this fault code is faulty exhaust gas recirculation valve.
Causes of 290900 air system air to egr air mass flow:
Leak air intake pipe.
Faulty air mass sensor.
Faulty throttle body.
Leak intake manifold.
Faulty exhaust gas recirculation valve.
Carbon disposition on sensor.
Damage wiring harness.
Faulty manifold absolute pressure sensor.
Symptoms of 290900 air system air to egr air mass flow:
Low power even at high RPM.
Engine warning light will illuminate on cluster meter.
It can create problem while driving at high speed.
Pick up issue while driving.
How to trouble shoot:
This problem is related to air intake into combustion engine. When fault code 290900 air system, air to EGR air mass flow, plausibility measure air mass compared with calculated air mass too high store in engine control module. It can be a serious problem to solve this. Because this fault code can be store in engine control module due minor or major leak at air intake system. To solve this problem you need to have work on it very carefully. As this is not an easy job to find out the leak in the intake system.
First thing to do in this problem is to open bonnet and go to check visually any leak at intake air pipe line after air mass sensor. If found any leak at intake air pipe or at air filter body than repair or replace that leak part. Check fault code after replacing or repairing air intake pipe. If this problem was due to leak air intake pipe than fault code should not be present after closing that leaky thing.
There is one more pipe in this system which is connected with air filters body from downside. Check that pipe if that is connected or not as if this pipe will not be connected with air filter body than also there will be fault of low amount of air entering into combustion engine. The disconnection of that air pipe can be recognize by listening the sound of engine. Because when that air pipe will not be connected with the intake hose pipe than engine will create different sound.
If there is no leak at intake pipe or at air filter body than it might be possible that air mass sensor is faulty. As it is calculating low amount of air entering into combustion engine. With the help of scan tool check reading of air mass sensor. Reading of air mass sensor should increase after acceleration, if it does than it not faulty. But if it doesn’t response any reading (increase or decreasing) after acceleration than it can be faulty. Replace that air mass sensor that can solve this problem. Also check wiring harness of sensor if it is damage than repair.
The other thing that can be the reason behind this problem is faulty manifold absolute pressure sensor. Manifold absolute pressure sensor is located on the top of intake manifold. Check reading of manifold absolute pressure sensor. Reading of sensor should increase or decrease according to accelerator pedal or press or depress. If reading of sensor is increasing or decreasing accordingly than it means that sensor is good and in working condition. If it does not than it can be faulty or there is carbon deposit on it from inside. Due to which sensor does not able to calculate pressure of air entering into combustion engine. Remove sensor from intake manifold clean or replace it properly so that it can measure calculate pressure of air properly.
Also check throttle body for this problem, check if throttle is working properly or not.
Most probably behind this problem the reason is a leaky air intake pipe. From where air enter into combustion engine directly without knowing air mass sensor. Due to which this fault code store in engine control module, repair or replace that faulty or leak air intake pipe so that there is no extra amount of air enter into combustion engine.
Also check intake manifold for leak. Because sometimes when intake manifold have a minor crack in it. From where air enter into combustion engine without triggering air mass sensor. This is also a big reason behind fault code store 290900 air system, air to EGR air mass flow, plausibility measure air mass compared with calculated air mass too high in engine control module.
Solution of 290900 air system air to egr air mass flow:
Repair or replace leaky air intake pipe.
Replace or clean faulty air mass sensor.
Clean or replace manifold absolute pressure sensor.
Clean throttle body.
Repair leak intake manifold.
Repair damage wiring harness sensor.
Common mistake while trouble shooting 290900 air system air to egr air mass flow:
Most of the time when 290900 fault code is store in engine control module. mechanic take it in the wrong way to solve this trouble codee. sometime they goes to change air mass sensor to get out of this trouble. Which is not a proper solution to get out of this solution. If you will read trouble code with concentration then it might be possible that you will understand what actually faulty code is indicating aboult. Do not replace any sensor or any part whitout diagnosing all the things properly.
Note:
When this fault code store in engine control module, leak intake of air into combustion engine is the main issue behind this. First of all check leak at the intake of air into combustion engine after air mass sensor. Check pipe line of air which go towards turbocharger and then check intake manifold if there is any crake on the intake manifold. Leal air is the main cause of this fault code to store into combustion engine.
Related trouble code that can help:
290b00 Air system air to egr air mass flow.
