MAF sensor on BMW e46. Hi.Im new to this forum and this is actually my first post. Problem I have is with my BMW 318 e46. When I start up my car in the morning and start driving right away it struggles very much and is jerking like mad, basically I need to stop and wait. Then after 5 minutes or so, everything goes away and car drives normally.
The MAF based SAP systems will shut down in about 5 seconds if the system does not detect that the proper amount of air is flowing. This can happen for either too much airflow or not enough airflow. If the SAP MAF fails, then it cannot report the proper amount of airflow so the system will shut down. Hood Grille Replacement. Project Time: 1 hour. BMWs are known for their kidney grills. E46 models are known for their kidney grill mounting tabs failing. In this tech article we show you to replace the front grilles in your E46. Applies to: BMW 325i (2001-2005) BMW 325Xi (2001-2005) BMW 325Ci (2001-2006) BMW 325ti (2001-2004)

It did set the SES light and the car was surging under light acceleration. You can try cleaning using CRC MAF sensor cleaner. Each time I cleaned it lasted less time than previously before setting the SES. The last time I tried it took only a day and I finally bit the bullet and changed it. Problem solved, car felt like it had another 50 hp.

The P115C code relates to the MAF (Mass Air Flow) sensor and a reading of air flow that is lower than expected. This means that either that the sensor itself is reading incorrectly or you have an issue with intake system not flowing enough air/leaking after the MAF. There are a few things that can cause this. One of these components is called the Mass Air Flow (MAF) Sensor, and it is perhaps the most crucial element in a car’s electrical fuel injection system. If something were to go wrong, it could result in serious problems. Bad MAF Sensor symptoms include rough idling, loss of power while accelerating, starting trouble, and more. CRC MAF (Mass Air Flow) Sensor Cleaner: The mass air flow sensor is meant to measure how much air mass is flowing into the engine intake. The ECM uses this information to decide how much fuel must be added to ensure a perfectly balanced air-fuel ratio. With most engines, 14.7:1 is the appropriate ratio. This means the engine utilizes 14.7 pounds of air for every one pound of fuel.

1. Disconnect the mass airflow sensor from the electrical connector. While pulling the connector, squeeze the tab on either side of the harness. Make sure you only pull on the connector and not the wires. If your hands slip off the connector, it is good to wear gloves with a rubberized coating. 2.

BW Part #: 13627566983. Brand: Continental VDO. (In Stock) Description. Customer Reviews. OEM replacement HFM for 2004+ E46 330i, E83 X3 3.0, and E85 Z4 3.0. Also fits the 2004-2005 E46 325i with M56 SULEV engine. The airflow sensor or HFM (Hot Film Meter) is hugely important in the performance and fuel economy of the engine.

Yes, both banks were at +12%. I changed the fuel filter and afterwards checked the fuel pressure, it was right smack at the 3.5 bar spec. I doubt it's a vacuum leak since my idle and cruise are perfectly smooth, and the power problem only appears at WOT. I'll use a another MAF sensor to verify if it was indeed the problem.
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    • bmw e46 mass air flow sensor problems