25378 posts · Joined 2008. #10 · Nov 21, 2011. According to my Bentley manual (page 130-9): A faulty MAF sensor can produce the following problems: - Difficult to restart when engine is hot. - Engine starts then stalls. - Engine starts and runs only with accelerator pedal depressed, etc. Step 2: Replace or clean the MAF sensor. Now would also be a great time to change your air filter while the cover is out of the engine bay. The MAF sensor is held into the airbox cover by two tamper-proof T20 screws. Use the tamper-proof T20 bit socket to remove the screws, then pull the sensor out of the cover. COG light that appears 5-10 seconds after every start. 2003 325i - Automatic & has the 6 pin MAF connector. The two codes…was the MAF sensor, and I believe the oil pressure switch. ^These are the only useful parts. Read the EGS (auto trans computer) fault codes and report back. The gear/cog light is enabled by the EGS. The mass airflow sensor (commonly abbreviated to MAF) is one of the most important engine management sensors. A bad mass airflow sensor can leave your Mercury Mariner's engine running rough, or even inoperable. A MAF sensor measures the density of the air entering the intake manifold. It passes this information onto your Mariner's ECU. The most common signs of bad mass air flow sensor (MAF) in Honda Civic are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic idling, misfires, poor exhaust emission values and sometimes black smoke comes out of the tailpipe. The mass air flow sensor is part of the engine’s intake system and is The MAF sensor on these cars rarely goes bad and is often not the root of your issue. Would recommend sticking with Genuine BMW or Siemens/VDO (OEM) for the MAF, and hold on to your original one, as well. Your 2000 323i does share the same MAF as the 99-01 Hyundai Sonata, which is significantly cheaper. Since the MAF sensor is responsible for measuring air flow into the engine, they have a lot of air passing through them. In fact, more than 9000 liters of air can flow through the engine for every liter of fuel used. That’s a lot of air! And with that comes the potential for a lot of contamination. Dust, dirt and other debris can all get into i have a few flat spots with my rev range, and i seem to be using my fuel quickly for a diesel. i had the same symptoms when i owned a Nissan S14, i changed the Air mass meter and problem solved, does anyone know where i can get a cheap but decent AMM and are they easy to change on the 320d? Mounted in the air intake duct or air filter housing, a sensor detects the air density as it heads into the engine intake to be mixed with fuel. Common mass air flow sensors use a heated platinum wire in the sensor that records an electrical resistance value in the car’s engine control module. As more air is drawn into the engine, the airflow The most common signs of bad mass air flow sensor (MAF) in VW Passat are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic idling, misfires, poor exhaust emission values and sometimes black smoke comes out of the tailpipe. The mass air flow sensor is part of the engine’s intake system and is located 1JQnS.