Question about 2002 BMW Z3

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2002 z3 bmw - mass air flow sensor???

I have 2002 z3 2.5 lt bmw. It has a cold air intake on it and it has some sort of air flow sensor in it (someone cut a hole in the intake and mounted the air sensor through the top of it. As soon as I plug into the sensor, the car would die. Now the car will start, but it dies (with the sensor not plugged in), that's the way it was working before, I drove it for a couple of days that way, it never worked perfect but it did work. Like I said, the sensor was not plugged in. Now the only way it will keep running is when I plug it in.....but as soon as I put it in gear it dies. The guy I bought it from stated it should have a master air flow sensor........could this be the problem???? thanks .....Kevin

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  • Anonymous Mar 30, 2014

    i did a complete car scan with a professional and these codes come up..i would like to know what are the solutions to each of these codes and are some of them diy or professional technician to handle the job.


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Hello There

Having driven many BMW's for the last 15 years, my advice is to remove the cold intake and go back to the factory original, the car runs alot smoother and the fuel economy is much better. the chapest way of doing this is to buy a second hand one from ebay etc as well as buying the original MAF sensor.

Hope this helps, please don't forget to rate me.

Posted on May 20, 2009

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Car runs very well after finding air leak at the air intake tube behind air filter, 2001 BMW Z3 3.0 Roadster with engine light on and codes P0171 and P0174, How do I fix?

The main issue here is that the computer can NOT makes the right mixture of fuel and air. So, you might need to change The Mass air flow sensor! This is one of the sensors that I had to change for 3 BMWs I've owned. Hope this help.
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I would replace the mass air flow sensor this is in the air intake tube

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Causes cylinder misfiremw z3

Yes, it is very possible for the Mass Air Flow sensor (aka MAF) to cause a misfire. You need to replace the MAF if it's causing a misfire. More detail please if this doesn't answer your question

Oct 10, 2013 | BMW Z3 Cars & Trucks

1 Answer


Here is the definition of the code.

P0101 GMC Description The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the ECM acertain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change.
Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
Read more:

Read more:

Jul 29, 2012 | 2002 GMC Safari

1 Answer

Check engine lght on and 2 codes p0103 and p0112

P0103 HYUNDAI - Mass or Volume Air Flow Circuit High InputPossible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notesBefore replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
P0112 HYUNDAI - Intake Air Temperature Sensor 1 Circuit Low InputPossible causes- Dirty air filter
- Intake air temperature (IAT) sensor harness is open or shorted
- Intake air temperature (IAT) sensor electrical circuit poor connection
- Faulty intake air temperature sensor
When is the code detected?An excessively low voltage from the sensor is sent to ECM.

Jun 08, 2012 | 2001 Hyundai Accent

1 Answer

1998 bmw z3 roadster 2.8 engine light came DTC code p0170

There is no one fix works on this O2 sensor code
P0170 - Fuel Trim Malfunction Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Jun 05, 2012 | 1998 BMW Z3 Roadster

1 Answer

Idles up and down on cold start

Probably a vacuum leak, but wandering idle can also be caused by cracks in the intake air tube between the mass airflow sensor and the throttle body, or by gunk in the idle air control valve.

Feb 05, 2011 | 1999 BMW Z3

1 Answer

Where is mass air flow senser on a 1989 buick regal


Thanks for using FixYa. The BUICK Regal Mass Air Flow sensor is usually installed in the intake air duct between the air filter and the throttle body mounted on the intake manifold. Also check the throttle body for mass air flow sensors location.
On mass air flow sensors with a sense wire, this wire can become contaminated with dust particles. These particles can be removed with automotive solvents that are safe for the use on mass air flow sensors. Before replacing the mass air flow sensor check for air leaks in the connecting air ducts and intake manifold. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor.

Bad or contaminated BUICK Regal Mass Air Flow sensor can possibly cause a wide range of various vehicle drivability problems such as stalling, especially when the engine is cold, misfiring, poor acceleration, etc. In addition, a problem with the Mass Air Flow sensor often causes the "check engine" or "service engine soon" light in the vehicle instrument panel to illuminate.

Please do accept the solution if the issue is resolved or else revert for further assistance.


Nov 09, 2009 | 1989 Buick Regal

1 Answer

2002 6 cylinder 3.o engine Ford Ranger. Cold start problem. Bank 1 code PO172 and Bank 2 code PO175. System to rich. Where to start checking.

Changed the air filter lately? Possibly defective O2 sensors, but I doubt it. If air filter and intake are clear, I'd check barometric pressure sensor and mass air flow sensors. Get a Haynes or Chilton's for $25 at Pep Boys for instructions on testing these componenets

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1 Answer

1998 BMW Z3 2.8 Idles rough when cold starting in wet weather

the problem could be in air mass flow sensor, but it's expensive

Jul 04, 2009 | 1998 BMW Z3 Roadster

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