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BMW Mass Air Sensor & Air Flow Meters

BMW Mass Air Sensor & Air Flow Meters We sell OEM air mass sensors, air flow meters, and HFMs (Hot Film Meter) for many BMWs. When the mass air sensor is bad you will notice your engine running out of tune. Your fuel mileage will suffer, throttle response will be poor, and you will notice a lack of power.

There should be a Check Engine Light to alert you that the air sensor is having problems. However, there may not be a fault code for the air meter itself. Often times the code comes up as fuel trim or lean condition. In these cases the air sensor could be just one of a number of potential problems.

We only sell air sensors from Original Equipment Manufacturers like, Bosch, VDO, and Siemens. Please note that HFMs are an electrical part and cannot be returned for refund.
For accurate results, specify your model below.
Mass Air Flow Sensor (MAF) This is the replacement mass air sensor to fit the N62 engine used in the E60 545i, E63 645ci, E65 745i/Li, and E53 X5 4.4i/4.8is. This HFM is manufactured by OEM supplier Bosch and is a direct replacement for the stock HFM. When the HFM goes bad there should be a fault code and check engine light. In addition, your fuel economy will usually go down as the computer is no longer getting a good signal of airflow and the safest thing for the computer to do is add fuel. Replacement is straight-forward and easy with simple hand tools.

This item fits the following BMWs:
2004-2005 E60 BMW 545i
2004-2005 E63 BMW 645ci
2002-2005 E65 BMW 745i 745li
2004-2006 E53 BMW X5 4.4i X5 4.8is
Part #: 13627566988
Price: $139.95 (USD) 
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E36 M3 Euro HFM (0 280 217 806) This Euro HFM (Hot Film Meter or mass air sensor) from the Euro M3 is larger in diameter than the USA's M3 meter. This HFM will meter and flow more air than the stock one, giving you more power. THIS REQUIRES PROPER SOFTWARE to run correctly and you may also need larger fuel injectors to prevent the engine from running lean.

We use this HFM on the 1995 M3 or any 1996+ S52 engine that has been converted to OBD-1 electronics. We prefer to use this HFM over the 540 meter because this is a direct bolt-on to the Euro airbox (for those that want a factory appearance). This HFM is not used on our OBD-2 Performance Kits or with OBD-2 Shark Injector software.

factory BMW part number = 13 62 1 403 123
OEM Bosch part number = 0 280 217 806
Part #: 13621403123
Price: $339.95 (USD) 
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HFM/Mass Air Sensor - E38 E39, X5 with M62 V8 Engine Replacement mass air sensor for the 1999+ M62 engine.

The M62 engines have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems.

This replacement HFM fits the following BMWs:
1999-2003 E39 BMW 540i
1999-2001 E38 BMW 740i 740il
2000-2003 E53 BMW X5 4.4i X5 4.6is
Part #: 13621433567
Price: $149.95 (USD) 
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HFM/Mass Air Sensor - E32, E34, E38, E39 with M60/M62 4.0-liter Engine Replacement mass air sensor for the M60/M62 engine. This HFM is an OEM part, made by Bosch (Bosch #0 280 217 800).

The M60 engines have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems.

This sensor is also known as the "540 HFM" that is used in a variety of OBD-1 E36 M3 upgrades.

This replacement HFM fits the following BMWs:
1993-1995 E34 BMW 540i
1997-1998 E39 BMW 540i
1988-1994 E32 BMW 740i 740il
1995-1998 E38 BMW 740i 740il
1990-1999 E31 BMW 840i 840ci
Part #: 13621702078
Price: $194.13 (USD) 
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HFM/Mass Air Sensor - E9x E60 E85 Z4 This is the replacement mass air sensor to fit the M54 and N52 engine used in the E9x 325i, 330i, E60 525i 530i and Z4 with N52 engine. This HFM is manufactured by OEM supplier Siemens/VDO and is a direct replacement for the stock HFM. When the HFM goes bad there should be a fault code and check engine light. In addition, your fuel economy will usually go down as the computer is no longer getting a good signal of airflow and the safest thing for the computer to do is add fuel. Replacement is straight-forward and easy with simple hand tools.

This item fits the following BMWs:
2006-2006 E90 BMW 325i 325xi 330i 330xi - Sedan
2006 E91 BMW 325xi - Wagon
2004-2007 E60 BMW 525i 525xi 530i 530xi
2006-2008 E85 BMW Z4 3.0i Z4 3.0si
Part #: 13627520519
Price: $229.95 (USD) 
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Genuine BMW Mass Air Flow Sensor - E28 E34 535i - E24 635csi - E23 E32 735i/il

Genuine BMW Replacement mass air sensor - air flow meter - (HFM) for M30 engine. The M30 engines have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems.

Price includes a $50.00 core charge.

This item fits the following BMWs:
1985-1988 E28 BMW 535i 535is
1989-1993 E34 BMW 535i 
1985-1989 E24 BMW 635csi
1985-1987 E23 BMW 735i
1988-1994 E32 BMW 735i 735il

Also for E30 M3 EVO III
 

Part #: 13627547981COKT
Price: $519.95 (USD) 
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HFM/Mass Air Sensor for M52TU, M54 Engine (E46, E39, Z3) Replacement mass air sensor for M52TU 2.5/2.8 and M54 2.5 engines. 3.0" diameter. Complete Application List:
1999-2000 E46 323i, 323Ci, 328i, 328Ci
2001-2002 E46 325i, 325Ci (M54 engine)
1999-2000 E39 528i
2000-2003 E39 525i
1999-2000 Z3 2.3, Z3 2.8
Part #: 13621432356
Price: $299.95 (USD) 
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HFM/Mass Air Sensor for Early M54 3.0-liter Engine (E46, E39, Z4) Replacement mass air sensor for the early M54 3.0-liter Engine. See application list below. 3.5" diameter. Complete Application List:
2001-2002 E46 330i, 330Ci
2001-2005 E46 330Xi
2001-2003 E39 530i
2001-2006 E53 X5 3.0
2001-2002 Z3 3.0
Part #: 13627567451
Price: $249.95 (USD) 
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HFM/Mass Air Sensor - E39 M5, Z8 Replacement OEM Bosch mass air sensor (HFM) for E39 M5 and Z8 with S62 engine.

This item fits the following BMWs:
1999-2003 E39 BMW M5
2000-2003 E52 BMW Z8 Roadster
Part #: 13621433566
Price: $139.95 (USD) 
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HFM/Mass Air Sensor for M54 3.0-liter Engine (E46, E39, Z4) Replacement mass air sensor for M54 3.0-liter Engine. This is a stock HFM and is a Genuine BMW part. 3.5" diameter Complete Application List:
2003-05 E46 325i, 325Ci - M56 engine only (SULEV)!
2003-05 E46 330i, 330Ci
2004-06 E83 X3 3.0i - M54 engine
2003-2006 E85 Z4 3.0i Roadster
Part #: 13627566983
Price: $354.95 (USD) 
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HFM/Mass Air Sensor - Z3 2.8 97-98, ZM3 98-00 (S52) Replacement mass air sensor / air flow meter.

This item fits the following BMWs:
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe (s52)
Part #: 13621707650
Price: $466.95 (USD) 
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HFM/Mass Air Sensor for E46 M3, E60 M5, E63 M6, MZ3-S54, MZ4 Replacement mass air sensor (HFM) for E46 M3 MZ3 with S54 engine, MZ4, E60 M5, E63 M6 with S85 engine.

This item fits the following BMWs:
2001-2006 E46 BMW M3
2006-2010 E60 BMW M5
2006+ E63 BMW M6
2001-2002 Z3 BMW M Roadster M Coupe with S54 engine
2003-2008 Z4 BMW Z4 M Roadster Z4 M Coupe
Part #: 13627839014
Price: $189.95 (USD) 
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HFM/Mass Air Sensor - E36 325i 1992, E34 525i 91-92

Replacement mass air sensor (HFM) for BMW 325i 1992, 525i 1991-1992 with M50 engine. The M50 engines in the E36 and E34 have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems. We also sell HFM sensor cleaner that may clear your problem (see below). Replaces part number 13621466359 / 0986280116.

Price includes $300.00 core harge.

This item fits the following BMWs:
1992 E36 BMW 325i 325is
1991-1992 E34 BMW 525i

Part #: 13627527518KT
Price: $1553.95 (USD) 
Quantity:   
HFM/Mass Air Sensor for M52 Engine (E36, E39) Replacement mass air sensor for M52, S52-US engines. This HFM is an OEM part, made by Siemens VDO. 3.0" diameter.The M52 engines in the E36 and E39 have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems. We also sell HFM sensor cleaner that may clear your problem (see below).Complete your repair with a new boot and new clamps by selecting the option below. Boots are OE-spec or Original BMW and we use high-quality factory-style clamps. Complete Application List:
1996-99 E36 323is, 323iC, 328i, 328is, 328iC
1996-99 E36 M3 3.2-liter
1997-98 E39 528i
Part #: TMS338007
Price: $318.45 (USD) 
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E36 M3 Euro HFM Adapter (to Stock Throttle Body Boot) This silicone adapter is used when fitting a Euro or 540 3.5" HFM to the stock intake boot on an E36 M3 S50 or S52. The stock intake boot is sized for the stock 3.0" HFM so a coupler is required to go from the new larger HFM to the smaller boot. Our HFM adapter includes a new hose clamp for the HFM end.
Part #: ADAPT
Price: $49.95 (USD) 
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Air Flow Meter - E30 325i 325is, E34 525i - M20 engine

Replace your faulty air flow meter with this Genuine BMW part. The mass air sensor can develop problems over time causing poor driveability and fuel economy. This unit is remanufactured by BMW so you can be assured of the highest quality part. 

Price includes $50.00 core charge. 


This item fits the following BMWs: 
1987-1991 E30 BMW 325i 325ic 325is 325ix 
1989-1990 E34 BMW 525i 

Part #: 13627547977KT
Price: $651.95 (USD) 
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Turner IAT Relocation Harness

If you've ever noticed your car feeling a bit sluggish after a few laps around the track, some hard driving, or even sitting in traffic on a hot day you may have been a victim of power loss due to heat soak.  All vehicles will lose some degree of performance due to heat soak under the right operating conditions.  The engine management system is constantly monitoring operating conditions and modifying parameters based on sensor inputs.  The problem is that BMW integrated the intake air temp sensor in the MAF housing, and often the MAF is sandwiched behind a hot radiator and in some applications next to an even hotter valve cover.  This is fine for overall simplicity and cost of the original engine management system, but less than ideal for optimal performance.  The MAF housing absorbs the excess heat from its surroundings and can’t shed it fast enough, and the ECU reads a falsely high intake air temperature.  It then incorrectly adjusts operating parameters to compensate for the false hot air measurement (pulling timing and running a leaner fuel mixture), and torque output drops like a rock.

The fix?  Locate an intake air temp sensor in a location where it can more accurately measure incoming air temps and where it is less prone to heat soak.  By mounting a sensor further away from the heat source and divorcing it from the mass of the MAF housing, it can both resist the effects of heat soak longer and respond to temperature changes more quickly.  The end result?  You’ll experience reduced loss in torque and more consistent power output when you’re pushing your engine hard. 

The Turner engineering team was initially skeptical of the claimed performance benefits of this modification.  We set out to first validate the functionality and performance benefit of a temp sensor relocation. We set out to replicate stop-and-go traffic heat soak in a 2001 540i in a controlled environment - our dynamometer. Four runs were performed with the dyno's cooling fans turned off to simulate heat soak like being stuck in traffic or low speeds, then the fans were turned on for three more runs to observe the recovery rate once air flow was reintroduced. This was done in stock configuration and then repeated with our sensor relocation kit. 

Result? We recovered 11lb-ft torque at 2500rpm by relocating the temperature sensor! This is a difference that can be felt behind the wheel - owners of M5s can expect an even larger recovery. Here are the heat soak-related torque losses we experienced: 

Stock IAT location Torque loss:
18rwtq at 2500rpm
10rwtq at 3000rpm
9rwtq at 3700rpm

Turner IAT Relocation Torque loss:
7rwtq at 2500rpm
5rwtq at 3000rpm
5rwtq at 3700rpm

Other “kits” on the market require you to cut and splice into your factory wiring harness. The Turner engineering team designed a complete plug and play kit that makes for quick, easy, and reversible installation. Original equipment weather-sealed connectors offer long term reliability, while sheathed wiring offers a clean appearance - you'll quickly forget it's under the hood. We found that different applications called for slightly different sensor positioning and cable routing, so our harness is nearly 3 feet long - long enough to provide flexibility in positioning, but not too long that you're left with unsightly excess wiring. We recommend positioning the sensor in a location away from engine heat, but still within the intake ducting (we found the far side of the airbox base to be a good home). Installation is as simple as drilling a small hole for the sensor and plugging in the harness.

We include everything you need to relocate your IAT - just select your desired sensor brand below (we recommend Beru).

Also the perfect plug-n-play option for anyone looking to upgrade their intake to utilize an Alpha-N tune!

Turner IAT Relocation Kit fits the following BMWs: 
1999-2001 E38 BMW 740i 740il
1999-2003 E39 BMW 540i M5* 
2006-2010 E6X BMW M5 M6*
2000-2003 E53 BMW X5 4.4i 4.6is
2001-2006 E46 BMW M3
2001-2002 MZ3 BMW M Coupe M Roadster
2006-2008 MZ4 BMW M Coupe M Roadster

*Despite the M5 having two MAF, temperature is only detected on the passenger side MAF, and therefore only one relocation is required.

Part #: 014579TMS
Price: $99.95 (USD) 
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Turner-Porsche 3.5 This 3.5" HFM is used in our OBD-II Performance Packages on the 1996-1999 E36 M3 (and MZ3 S52). This is a Plug & Play and seamless kit built using a Porsche HFM, custom wiring harness adapter, and harness mounting bracket. This HFM is preferred because it has a greater resolution and reads larger quantities of air more precisely than the 540 or Euro M3 HFMs. We have put together this kit to be completely reversible and plug and play using factory plugs and connectors. It requires no splicing or modification of your stock connector harness, avoidng the pitfalls that can come from exposing your factory wiring. Using this without the harness will require you to bridge the grounds of the factory harness together in order for the HFM to send the correct signals to the computer.

The correct software, and related intake components, are required to use this larger HFM! See below for software options from Turner Motorsport. Or click here for our complete list of E36 Performance Packages.

Software Options
Stage 2 - 3.5" HFM, "24lb" injectors
Stage 3 - 3.5" HFM, "24lb" injectors, Schrick camshafts
Stage 3+ - 3.5" HFM, "24lb" injectors, Schrick camshafts, M50 manifold
Stage 4 - 3.5" HFM, "24lb" injectors, Schrick camshafts, headers
Stage 4+ - 3.5" HFM, "24lb" injectors, Schrick camshafts, headers, M50 manifold
Stage 5 - 3.5" HFM, "24lb" injectors, Schrick camshafts, headers, cat-delete

This 3.5" HFM is intended for the following BMWs:
1996-1999 E36 BMW M3
1997-2000 Z3 BMW M Roadster M Coupe
Part #: TEN9989HFM
Price: $499.96 (USD) 
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HFM/Mass Air Sensor for M50 Engine (E34, E36)

Replacement mass air sensor (HFM) for M50, S50-US engine. The M50 engines in the E36 and E34 have a notorious fault for hesitation and sluggish response. If this is your situation the MAF should be on your list to check. The HFM is easy to replace and could cure a variety of problems. We also sell HFM sensor cleaner that may clear your problem (see below). This mass air sensor also fits M60B30 engine. 3.0" diameter.

Complete your repair with a new boot and new clamps by selecting the option below. Boots are original BMW and we use high-quality factory-style clamps.

 

Complete Application List:
1993-95 E34 525i - M50 engine with VAN0S (M50TU)
1993-95 E36 325i, 325is, 325iC - M50 engine with VAN0S (M50TU)
1995 E36 M3 3.0-liter
1994-95 E34 530i - M60 3.0-liter engine

 

Part #: 13621747155
Price: $199.95 (USD) 
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