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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-01-2015, 02:03 PM   #21
wasp9166
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speaking of vdo, i bought another set of conti extreme contact dw for my mazda cuz they are fkn awesome

but filling out the rebate info i saw general tire , so i did some research


it appears not only did conti acquire general tire, which i think make garbage tires, but they also own vdo



https://en.wikipedia.org/wiki/Continental_AG
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Old 07-01-2015, 02:45 PM   #22
BMW-North
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Quote:
Originally Posted by waz664 View Post
To all that might be looking to replace a MAF, the most important thing is that it is designed for the exact same displacement engine. A MAF off of a 325 will not work on a 330 since the volume of the engine is different and the MAF signal will be wrong. I have seen MAFs off Hyundai engines that are OEM Siemens and look identical but that 6 cyl engine has a 2.7L displacement. This will plug in perfectly but cause all sorts of DME issues since it will indicate to the computer that either you have too much or too little air depending on the engine you plug it in to.

It would be nice to determine if there is an aftermarket source for a MAF that works properly and doesn't have a $300 BMW price tag. Ultimately the circuit concept of both the 3 and 5/6 wire versions is pretty simple so long as it was designed for the right displacement. The trick is to get enough POSITIVE feedback from success stories to understand the safe alternate brand.
I don't believe this is correct? The MAF quoted in the Seimens catalogue and this post (linked) is an exact fit for the 325 and the Hyundai Sonata. Siemens makes it and is set from factory for both setups.

I know the part is exactly the same as I had a beef with the local Car Quest dealer who had different prices for it despite the fact that the order pickers took them from the same bin when filling orders.

I have attached a link to the Siemens catalog so you can see. The Siemens part number 5WK96050Z (on page 11) and you can see the cars it is used in.

http://www.krautli.pt/catalogos/SIEM...de%20Motor.pdf

Edit: Lastly, Real OEM lists the same MAF for a variety of e46's with 3 different engine displacements


http://www.realoem.com/bmw/enUS/part...356&series=E46

13621432356
Hot-film air mass meter

Part 13621432356 was found on the following E46 vehicles:
3' E46, 320Ci, Convertible, M54, EUR, (BS11) : Hot-film air mass meter
3' E46, 320Ci, Convertible, M54, EUR, (BS12) : Hot-film air mass meter
3' E46, 320Ci, Convertible, M54, EUR, (BW11) : Hot-film air mass meter
3' E46, 320Ci, Convertible, M54, EUR, (BW12) : Hot-film air mass meter
3' E46, 320Ci, Coupe, M54, EUR, (BD11) : Hot-film air mass meter
3' E46, 320Ci, Coupe, M54, EUR, (BD12) : Hot-film air mass meter
3' E46, 320Ci, Coupe, M52, EUR, (BM11) : Mass air flow sensor
3' E46, 320Ci, Coupe, M54, EUR, (BN11) : Hot-film air mass meter
3' E46, 320Ci, Coupe, M54, EUR, (BN12) : Hot-film air mass meter
3' E46, 320i, Sedan, M52, EUR, (AM11) : Mass air flow sensor
3' E46, 320i, Sedan, M52, EUR, (AM12) : Mass air flow sensor
3' E46, 320i, Sedan, M52, EUR, (AN11) : Mass air flow sensor
3' E46, 320i, Sedan, M52, EUR, (AN12) : Mass air flow sensor
3' E46, 320i, Sedan, M54, EUR, (AN15) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (AN16) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (AV11) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (AV12) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, USA, (AV13) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (ET15) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (ET16) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (EV11) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, EUR, (EV12) : Hot-film air mass meter
3' E46, 320i, Sedan, M54, USA, (EV13) : Hot-film air mass meter
3' E46, 320i, Touring, M52, EUR, (AR11) : Mass air flow sensor
3' E46, 320i, Touring, M54, EUR, (AW11) : Hot-film air mass meter
3' E46, 320i, Touring, M54, EUR, (AW12) : Hot-film air mass meter
3' E46, 320i, Touring, M54, EUR, (EN11) : Hot-film air mass meter
3' E46, 320i, Touring, M54, EUR, (EN12) : Hot-film air mass meter
3' E46, 323Ci, Convertible, M52, EUR, (BR31) : Mass air flow sensor
3' E46, 323Ci, Convertible, M52, EUR, (BR32) : Mass air flow sensor
3' E46, 323Ci, Convertible, M52, USA, (BR33) : Mass air flow sensor
3' E46, 323Ci, Coupe, M52, EUR, (BM31) : Mass air flow sensor
3' E46, 323Ci, Coupe, M52, EUR, (BM32) : Mass air flow sensor
3' E46, 323Ci, Coupe, M52, USA, (BM33) : Mass air flow sensor
3' E46, 323i, Sedan, M52, EUR, (AM31) : Mass air flow sensor
3' E46, 323i, Sedan, M52, EUR, (AM32) : Mass air flow sensor
3' E46, 323i, Sedan, M52, USA, (AM33) : Mass air flow sensor
3' E46, 323i, Sedan, M52, EUR, (AN31) : Mass air flow sensor
3' E46, 323i, Sedan, M52, EUR, (AN32) : Mass air flow sensor
3' E46, 323i, Sedan, M52, USA, (AN33) : Mass air flow sensor
3' E46, 323i, Touring, M52, USA, (AR33) : Mass air flow sensor
3' E46, 325Ci, Convertible, M54, EUR, (BS31) : Hot-film air mass meter
3' E46, 325Ci, Convertible, M54, EUR, (BS32) : Hot-film air mass meter
3' E46, 325Ci, Convertible, M54, USA, (BS33) : Hot-film air mass meter
3' E46, 325Ci, Convertible, M54, EUR, (BW31) : Hot-film air mass meter
3' E46, 325Ci, Convertible, M54, EUR, (BW32) : Hot-film air mass meter
3' E46, 325Ci, Convertible, M54, USA, (BW33) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, EUR, (BD31) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, EUR, (BD32) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, USA, (BD33) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, EUR, (BN31) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, EUR, (BN32) : Hot-film air mass meter
3' E46, 325Ci, Coupe, M54, USA, (BN33) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (AN35) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (AN36) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, USA, (AN37) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (AV31) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (AV32) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, USA, (AV33) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (ET35) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (ET36) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, USA, (ET37) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (EV31) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, EUR, (EV32) : Hot-film air mass meter
3' E46, 325i, Sedan, M54, USA, (EV33) : Hot-film air mass meter
3' E46, 325i, Touring, M54, EUR, (AW31) : Hot-film air mass meter
3' E46, 325i, Touring, M54, EUR, (AW32) : Hot-film air mass meter
3' E46, 325i, Touring, M54, USA, (AW33) : Hot-film air mass meter
3' E46, 325i, Touring, M54, EUR, (EN31) : Hot-film air mass meter
3' E46, 325i, Touring, M54, EUR, (EN32) : Hot-film air mass meter
3' E46, 325i, Touring, M54, USA, (EN33) : Hot-film air mass meter
3' E46, 325ti, Compact, M54, EUR, (AT31) : Hot-film air mass meter
3' E46, 325ti, Compact, M54, EUR, (AT32) : Hot-film air mass meter
3' E46, 325xi, Sedan, M54, EUR, (AS31) : Hot-film air mass meter
3' E46, 325xi, Sedan, M54, USA, (AS33) : Hot-film air mass meter
3' E46, 325xi, Sedan, M54, EUR, (EU31) : Hot-film air mass meter
3' E46, 325xi, Sedan, M54, USA, (EU33) : Hot-film air mass meter
3' E46, 325xi, Touring, M54, EUR, (AR71) : Hot-film air mass meter
3' E46, 325xi, Touring, M54, USA, (AR73) : Hot-film air mass meter
3' E46, 325xi, Touring, M54, EUR, (EP31) : Hot-film air mass meter
3' E46, 325xi, Touring, M54, USA, (EP33) : Hot-film air mass meter
3' E46, 328Ci, Coupe, M52, EUR, (BM51) : Mass air flow sensor
3' E46, 328Ci, Coupe, M52, EUR, (BM52) : Mass air flow sensor
3' E46, 328Ci, Coupe, M52, USA, (BM53) : Mass air flow sensor
3' E46, 328i, Sedan, M52, EUR, (AM51) : Mass air flow sensor
3' E46, 328i, Sedan, M52, EUR, (AM52) : Mass air flow sensor
3' E46, 328i, Sedan, M52, USA, (AM53) : Mass air flow sensor
3' E46, 328i, Sedan, M52, EUR, (AN51) : Mass air flow sensor
3' E46, 328i, Sedan, M52, EUR, (AN52) : Mass air flow sensor
3' E46, 328i, Touring, M52, EUR, (AR51) : Mass air flow sensor
3' E46, 328i, Touring, M52, EUR, (AR52) : Mass air flow sensor

Last edited by BMW-North; 07-01-2015 at 03:00 PM.
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Old 07-01-2015, 03:07 PM   #23
clabcon
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I replaced my MAF with a genuine Siemens/VDO recently. This solved my lean codes on both banks, as my old one was undereporting airflow. Power is restored and idle is smooth as before, however I now have a new problem. From 6100 to the 6500 rpm redline I get a hissing from the UK passengers side / US drivers side firewall. I think it could be the exhaust flap vacuum line but am not sure why this only happens beyond 6000 rpm. M54B30.
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Old 07-01-2015, 08:44 PM   #24
waz664
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@BMW-North

You are exactly correct. I wasn't very clear. My point was meant to be two-fold. First that the MAF must match the displacement of the engine, however, one MAF can be used across many makes and models. Second, aftermarket MAFs are probably subject to problems because they are not held to a tight enough tolerance. I would love to hear if anyone had any luck using a MAF other than Bosch or Siemens.
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Old 07-02-2015, 06:36 AM   #25
wasp9166
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Quote:
Originally Posted by clabcon View Post
I replaced my MAF with a genuine Siemens/VDO recently. This solved my lean codes on both banks, as my old one was undereporting airflow. Power is restored and idle is smooth as before, however I now have a new problem. From 6100 to the 6500 rpm redline I get a hissing from the UK passengers side / US drivers side firewall. I think it could be the exhaust flap vacuum line but am not sure why this only happens beyond 6000 rpm. M54B30.
how many miles?
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Old 07-02-2015, 07:38 PM   #26
clabcon
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Quote:
Originally Posted by wasp9166 View Post
how many miles?
120k miles
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Old 07-03-2015, 01:57 AM   #27
BaliDawg
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Quote:
Originally Posted by waz664 View Post
the MAF must match the displacement of the engine
I don't think this is specifically true. What matters about the MAF is the diameter of the air passage. The amount of air passing through is calculated by the DME as the mass of air per unit time. The DME calculates this by knowing the cross-sectional area of the air passage. The engines listed in that post all use the same diameter intake and therefore can use the same MAF even though they have different displacements. The 330 uses a larger intake so needs a different MAF, not because of a larger displacement.

You could theoretically run OP's MAF on a 10 liter engine, but it would be severely air restricted.
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Old 12-18-2016, 09:25 PM   #28
ssurfer4
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I have a 2004 330ci that has had a P0175 (system too rich bank 2, current fault) and P0172 (system too rich bank 1, pending fault). I took it to a shop and they hooked it up. I was told the maf is on the edge but barely in spec. My thought is that if the maf is bad it is over-fueling and causing a rich code.

I recently replaced both intake boots (regular maintenance). the shop told me that the next place they would look is the fuel injectors. I pulled the injectors, sonicated them in seafoam. pulled the plugs and they look good (15k on them). I looked into the the cylinder via spark plug holes and inside where the fuel injectors sit and didn't see any major carbon buildup, pulled the upstream O2 sensor and it looked fine (no carbon buildup). i have not pulled the downstream O2 sensor. I did replace the small section of vacuum hose attached to the fuel filter (which is also relatively new).

Per much of my reading, a bad maf would cause a lean code but also a bad maf could cause over-fueling too. so I am now at a loss without buying a new maf.

I did see on the maf that the solder joints had a small amount of rust on them. This is not the the first maf this has happened to me with. I have a vdo/siemens. the shop told me that should not be an issue.

The car has 212k. before the above work I stated, the car would occasionally idle rough at stop lights but not a constant issue. since the work, car has no issues. mileage has never changed during any of this. so i thought i would check here before buying a new maf or paying $125/hr at the shop.

Is there a way I can test the maf with a multimeter or something? sorry for the long post.

I have put about 400 miles on and the code is still there. I was hoping the car would clear the code instead of me doing it.
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Old 12-18-2016, 09:57 PM   #29
jfoj
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You cannot really test a MAF with a multimeter.

Most MAF's age and degrade and then they UNDER report the airflow causing a Lean condition.

This is not rocket science. I cannot believe the shop was blaming the injectors, they rarely have problems.

Need far more info.

Warm Idle Fuel Trims, exact DTC's (trouble codes) and Freeze Frame data.

If the car has original O2 sensors, they probably need to be replaced as well, I would only worry about the Pre-cat sensors.

If the fuel pump is original, it WILL leave you stranded soon!

Search my user name for posts and read the links below in my signature.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 12-18-2016 at 09:57 PM.
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Old 12-18-2016, 10:21 PM   #30
ssurfer4
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Unfortunately, I don't have any of those numbers without taking it to the shop and getting it from them. I'm not even sure they would give me that info, instead wanting me to pay them to diagnose and fix.

His reasoning regarding the fuel injectors was this: a car with the mileage mine has tend to build up carbon on the piston heads. That build up will hold gas that is not ignited and then pushed out with the exhaust gas, causing a rich code. That is why I peeked into the cylinder with a flashlight when I had the plugs and injectors out and didn't see major build up. BUT, I'm not a certified mechanic and haven't peeked into many cylinders to know exactly what I am looking at.

The shop told me 1-2 hrs to diagnose. But even then, they could replace one thing only to find it's another. Well, I am just as capable as they are at throwing parts at a problem. I do all the maintenance and work on this car as I can, which is most of it. However, I try to do my research when it comes to problem shooting.

The O2 sensor and fuel pump have both been replaced in the last 3-4 years. I do put a lot of highway miles (about 23k-25k/yr).

I have a DIS v57 on my laptop but am not able to get it to connect to the car as I haven't had a whole lot of time to mess with that. I believe that will give me the numbers you are requesting but I don't have them at the moment.

Is it worth $250 to have the shop give me all those numbers/readings? I would hate to do that to find out is the maf and then spend another $250 on the new maf. The current maf was bought/installed 7/2014 so no chance of warranty

When the previous maf went bad, it was diagnosed by a friend (10 hrs away now in MN) with a oscilloscope. But, I no longer have access to that opportunity (on a free basis anyways).

The car is running good now and averaging 30+ mpg on the highway (6th gear) and that is what I have always gotten.

I love love this car and it hates hates my wallet...and at times, my patience. But I love it more than it hates me LOL I really want to get this car to 300k+ miles and try my best to maintain it.

I appreciate the help and guidance. Thank you
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Old 12-18-2016, 10:32 PM   #31
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Forget DIS.

Assume you have a smart phone or tablet??

You want to buy the OBDFusion App and the appropriate VeePeak interface from Amazon.com. Less than $30 for both.

Android requires Bluetooth, iProducts requires Wifi.

OBDFusion is a generic ODBII app but provide Live/Realtime data, Freeze Frame and DTC's (trouble codes), Emission Readiness Monitor Status and has the ability to Log the ODBII PID's in real time.

I seriously doubt the codes are really Rich codes, most Rich codes are bogus due to faulty sensors. When most everything on a vehicle degrades it under reports and/or provides less fuel causing Lean conditions.

Forget all the other suggestions from the shop.

If you do not want to diagnose or spend time, just buy a replacement MAF. A OEM Siemens/VDO MAF is around $200 if you know where to get them.

You might want to read this thread - Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

PLENTY of problem areas on these cars.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 12-18-2016 at 10:32 PM.
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Old 12-18-2016, 10:48 PM   #32
ssurfer4
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I have the OBDII Torque app on my tablet and will see what info I can get from that. I will also look into the products you mentioned and read up more as I get time. Thanks for the links as well.

I was just trying to follow the shop's guidance and see what I could find. The one good thing is that I did replace an old vacuum hose connection at the fuel filter, so that is good I guess.
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Old 12-18-2016, 10:51 PM   #33
ssurfer4
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I already have a bluetooth OBDII plug. So, do I just need the app for android? Or do I need the VeePeek specifically? Again, thank you
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Old 12-18-2016, 11:20 PM   #34
jfoj
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Torque is OK, but it is buggy.

OBDFusion for Android is a whopping $3.99.

You need to read the PDF in this thread - http://forum.e46fanatics.com/showthread.php?t=1097893
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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