Question about 2001 Mercedes-Benz E-Class
Good explanation regarding air sensor,for my opinion,visual check for unmetered air(air leak0,maybe fuel octane reseting.
Posted on Feb 01, 2009
Those codes do appear to deal with the mass airflow sensor. The MAF sensor is probably the "hot wire" type where a thin wire is suspended inside the body of the sensor and is heated with electrical current. The amount of air passing over the wire is directly proportional to the resistance of the wire and that resistance data is calculated. The MAF sensor, by itself, cannot determine the air mass supplied to the intake plenum. One or more other sensors are used in conjunction to equate these values. The oxygen sensor(s), Manifold Absolute Pressure (MAP) sensor, the Intake Air Temperature (IAT) sensors may all play a part in this fault reading.
There are reliable methods to test the MAF sensor. One well takled about method is to tap the MAF sharply with a screwdriver handle while the engine is running. If the engine dies, the MAF is faulty. This can detect a physical defect in the wire and a few other things but do do assume that, after repeated blows to the MAF with your dead blow hammer for good measure, that the MAF is at 100%. I will research some text on testing these sensors on that particular model and post links to any information and diagnostic data I find.
Posted on Jun 04, 2008
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When the service engine soon light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.
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