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Whilst this has been a quick and simple guide to resolving your Mercedes Benz P0101 issues, they can be avoided entirely by keeping your car serviced and looked after by professionals. If you’re not sure what the issue is, don’t try to figure it out yourself; enlist the help of someone that knows what they’re doing. Here at Xenons4U, we offer a selection of automotive parts to help you get your Mercedes back to its peak performance levels.<img width="363" src="">The mass airflow meter is an air flow sensor, also known as a MAF sensor and is an integral component of a vehicle’s electric engine management system. It can be found in the plastic housing between the engine and air filter. The role of an air flow sensor is to measure the volume and density of air entering the engine.The thing is, now even at maximum flow , I'm only pulling 3.8 volts, leaving 1.2 volts and about 700 CFM worth of meter that will never be used. Yes, you have room to grow should you add a bigger cam, etc. but there's more to it than that. WAI MAF sensors maintain +/- five percent of output over temperatures ranging from -20 to +70°C. Designed with United States OEM manufacturing equipment, WAI MAF sensors feature the precision required to match OE benchmark calibrations. All MAF products are tested to OEM specifications prior to shipment. For those of you who have fault codes the following links are well worth a read..<ul> <li>It’s a very useful invention, but at the same time it is very sensitive to change, and a faulty or one that is incorrectly setup will cause you issues.</li> <li>I have no leaks at all exept between the turbo and downpipe.</li> <li>This page explains the design and function of the air-mass sensor.</li> <li>Pulled the plug on top of the MAF as i had heard if it is definitly a faulty sensor it will run better disconnected, didn't seem to make any difference.</li> <li>For example if you take the Astra VXR cross over it has a 90 degree bend on either side and this bend is taken into account when the original MAF calibration was written.</li></ul>In order to do this it needs to know the exact characteristics of the MAF meter, which are hard-programmed into the software. The 4.0 Litre Discovery actually had a smaller Mass Air Flow meter fitted than the later 4.6 version, or indeed the 4.0 and 4.6 P38 Range Rovers. In my humble opinion, it was a pretty blatant attempt to limit the power output of the Discovery when compared to the 4.0 Litre P38 Range Rover. Coupled with the lean fuelling and retarded ignition mapping, it was a very effective method of hobbling the Discovery to suit marketing needs.<h2>Vw Wheels, Brakes & Suspension</h2>A re-profiled Fuel Map which provides good fuel economy on part throttle, and allows engine to rev more freely . This produces quicker, more progressive throttle response and better mid range torque. Mass airflow is proportional to the torque that the engine is producing , and hence it is closely related to the engine capacity. This is also heavily influenced by atmospheric conditions such as barometric pressure, temperature, etc. Whilst the Motronic system will run a 4.6 engine even with a 4.0 Litre tune and standard MAF, you certainly won’t be getting the best out of it. As your motor has Oxygen sensors in the exhaust, the fuelling runs in closed-loop which gives it the ability to trim the fuelling to suit the engine.People have managed to get them working with the standard Motronic engine management system using reconfigured chips; off the shelf kits can be bought just like this. As with everything, there are pros & cons to a modification. Some people when fitting a MAF have found that the car hasn't run so well, with either poor idling or power loss. Some MAFs use a diaphragm instead of a wire and are known as hot-film MAFs. These can return even more accurate results but are a very delicate technology, with the film needing replacement after a few years of usage. However, their operating principle is the same as hot-wire MAFs.<h2>Lights</h2>That might help, but often isn't even very good, much less the 'perfect' running we wanted when we installed the MAF sensor. We might move all the corrections to a fixed value so that the engine idles properly. That might take a correction factor of 105%, for example.To Reserve your products at one of our 250+ branches, simply choose Click & Collect at checkout method and enter your postcode. Our system will than check the latest stock at your nearest branches and if items are in stock you can reserve them by filling a quick Reservation form. I emailed a company called Pmas and inquired about any potential sensors that could fit the bill for my application. I sent them a picture of a wiring schematic diagram I took during the time I used to work for a Honda dealer as well as the wire pinout and no good news yet. https://www.crvownersclub.com/threads/af-sensor-2.214342/ It is measured by the deflection of the flap located in the Air flow sensor. The flap is connected to the potentiometer which then sends a signal to the ECU. The ECU mapping will need revision to accommodate the larger capacity, and here are the reasons why you would get a bad result from a 4.6 engine on a 4.0 map. The engine’s fuel and ignition requirements are determined by engine speed and load. Engine load is determined by measuring the true mass of air that the engine is consuming at any particular speed, using the “Hot Film” Mass Air Flow meter.Calibration may not make any obvious sense to the you the user, so you must have a secondary measure of its 'goodnees'. This can be another sensor (ex. MAP), how the engine runs, EGO feedback, etc. Maybe we have 105% at idle, and 125% at maximum flow, with the correction scaled for values in between.