Monday, October 18, 2021
Home2007-2013 3 Series (E9x)BMW Mass Air Flow Sensor Replacement - 1,3,5,6,7,X1,X3,X5,Z4 N52 6cyl.

BMW Mass Air Flow Sensor Replacement – 1,3,5,6,7,X1,X3,X5,Z4 N52 6cyl.

Repair Summary
This article gives detailed instructions on replacing the mass air flow sensor (MAF) in a BMW vehicle with the N52 6 cylinder engine. Even though we used a 2006 530xi to perform this repair, this article can be applied to any BMW vehicle with the N52 engine including most 2004-2013 1, 3, 5, 6, 7, X1, X3, X5, and Z4 models minor modifications to the repair steps.

A BMW Mass Air Flow Sensor (MAF) replacement in your N52 6 cylinder engine can help cure rough idles and clear instrument cluster error lights.

One of the most misunderstood components of the BMW engine intake system is the mass air flow sensor, often referred to as the BMW MAF sensor (or the "hot-film air mass meter" for those hardcore mechanics). The mass air flow sensor is part of the engine's air management system that includes all of the components involved with delivering metered fresh air to the cylinders. It is located on the intake pipe directly downstream from the intake muffler (air filter box).
The BMW MAF sensor is in charge of calculating how much air is entering the engine through the air filter element. This data is sent to the engine control module (the ECU...or sometimes referred to as the DME on BMWs) where it is used to adjust the amount of fuel being sprayed into the cylinders by the injectors. This delicate balance of measuring airflow and adjusting fuel delivery is what makes the BMW N52 six-cylinder engine so economically efficient and run so smoothly.

BMW Mass Air Flow Sensor Symptoms

Obvious signs that your BMW MAF sensor is failing are a rough idling engine (especially when warm) and poor acceleration. It will also (usually) cause a Service Engine Light (SEL) to appear in the instrument cluster. For those home mechanics with a diagnostic scanner, a bad mass air flow sensor will normally throw one of the following error codes: 2D15 or 2D16.
Since the rough idling and poor performance issues can also be attributed to other problems with your BMWs engine, it is best to diagnose your N52 six-cylinder before replacing the mass air flow sensor.
Replacing the BMW MAF is an extremely simple process that takes about ten minutes to perform in most affected vehicles. We strongly recommend attempting to clean your MAF prior to purchasing a new one with CRC Electronic Cleaner...some times dirt can accumulate on the internal element causing it to malfunction. That being said if your BMW's N52 engine has 120,000 plus miles on it, then it makes better sense just to replace the entire sensor with a new one.
Required Parts
All N52 engines
Roadfar is an Amazon BMW OEM parts brand that sells MAF sensors for half the price of a Genuine BMW part. They work fantastic and are backed by a good amount of reviews. We highly recommend these Amazon brands as you just can't beat their quality of product combined with phenomenal prices. They also offer free shipping.
All N52 engines + FREE Prime Shipping
TOP quality MAF Mass Air Flow Sensor, constructed of premium material with minimal intake resistance, fast response, accurate measurement, stable and reliable performance that achieves long-lasting durability. YunStal is one of the few brands offering this Air Flow sensor for the N52 engine on Amazon. They have a long history of overachieving and taking care of their customers. We recommend them to anyone looking for a great deal on another quality MAF sensor.
Repair Steps
Section 1 - Replacing the N52 BMW MAF Sensor
As mentioned above, the mass air flow sensor on the N52 engine is conveniently located on the air intake pipe next to the intake muffler (air filter housing). Care should always be taken when disassembling your intake system...cracking a pipe or fitting can cause vacuum leaks.
  1. Locate and identify the BMW MAF. It is located on the intake pipe just downstream of the intake muffler.bmw n52 mass air flow sensor replacement - locate the MAF
  2. Remove the lid from the intake muffler. In most models, plastic latches hold the lid in place.bmw n52 mass air flow sensor repair - Remove the lid from the intake muffler
  3. Using a metal pick, GENTLY lift the plastic retaining tab on the BMW mass air flow sensor plug. Unplug the mass air flow sensor.Locate the mass air flow sensor on the intake pipebmw n52 mass air flow sensor repair - Use a metal pick to remove the mass air flow sensor from the intake muffler cover
  4. Use a flat blade screwdriver to loosen the hose clamp securing the intake pipe to the intake muffler lid.bmw n52 mass air flow sensor repair - Loosen the intake pipe hose clamp with a flat blade screwdriver
  5. Remove the intake muffler lid from the vehicle. Using a T25 torx bit, remove the two screws securing the mass air flow sensor to the intake muffler lid. Pull the sensor free from the lid.Remove the mass air flow sensor with a torx bit
  6. Remove the mass air flow sensor from the intake muffler lid.bmw n52 mass air flow sensor repair - Remove the mass air flow sensor from the vehicle
  7. Replace the sensor and reassemble the vehicle following the above steps in reverse.
BMW Mass Air Flow Sensor - N52 6 Cylinder Replacement Finished
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