Question about 2001 BMW 330

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I broke the end of the mass air flow sensor and was wondering if I need to change the MAFS the car still run as it has the chech engi e light was on before this

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Yes you need the mass air flow.

Posted on Mar 12, 2010

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My 02 ranger has no power after 35 mph really bad up hills what could be the reason I changed fuel pump/filter wires plugs

-Sounds like bad throttle position sensor and dirty mass air flow sensor.
-Remove and clean it.

Good Luck


Jan 08, 2016 | Cars & Trucks

1 Answer


Looks like you have changed about all the sensors with exception of the Mass Air Flow Sensor mounted on the air filter housing, and the Oxygen sensors. I would venture to say it is the MAFS, mass air flow sensor.

Aug 16, 2013 | 1991 Ford Bronco

1 Answer

I have 2004 Honda crv try to find mass airflow sensor ?

The mass air flow sensor is just past the air filter. In other words if the air flow comes into the air box it flows through the filter then into the MAFS. It should be the first electrical plug past the air filter on the engine side of the filter.

Feb 25, 2013 | Cars & Trucks

1 Answer

Engine stalls going down the road, then starts right back up

Possibly - Mass Air Flow Sensor, poor oxygen mix
Possibly -Air Intake Sensor at Intake manifold, clean with carb cleaner.
Possibly - Crank Shaft Positioning Magnet, not aligning properly
Possibly - Oxygen senors, 1 before catalytic and 1 after it, poor exhaust eventing stemming from clogging catalytic converter
Possibly - Clogging in fuel delivery system starting from fuel pump and ending at intake manifold.

I would check these in that order.

May 27, 2012 | 2000 Pontiac Grand Prix

4 Answers

P0101 code for check engine light.. possible solutions???

Diagnostic Test Code (DTC) P0101 has a generic description of "Mass or volume air flow circuit range/performance problem". This can be caused by several things including:
> Dirty air filter
> Air leak in air intake system
> Contaminated, deterriorated or damaged Mass Air Flow Sensor
> Poor electrical connections at the Engine Control Module, the Mass Air Flow (MAF) sensor or the Throttle Position Sensor (TPS)
> Faulty MAF or TPS

You should check your air filter and air intake system visually and correct any obvious defects/leaks first.

If a visual inspection does not turn up the cause, then you will need a scan tool capable of reading sensor data to verify the function of the MAF and TPS. You will also need proper electrical diagnostic equipment to verify the integrity of the circuits and continue with diagnosis.

Sep 11, 2011 | 2005 Kia Rio

1 Answer

My truck is v6 4.2l and have 2 codes p0171 and p0172 what i can do for fix

Have you cleaned the MAFS ( Mass Air Flow Sensor ) which is in the intake by the air filter ( little tower with hole in it ).
Usually the lean conditions are reported due to un-metered air in the system which could be the MAFS not keeping track correctly due to it being dirty.
The other problem could be cracked vacuum lines, usually the one to the back of the throttle body ( under the plastic cover ). This is another way for unmetered air getting into the system.

Start with cleaning the MAFS ( with MAFS safe throttle body cleaner, the can will specifically state MAFS safe, don't assume ), after putting it back together ( making sure the tubing is together from the MAFS to the throttle body ) disconnect the battery for 10 min, reconnect and take for a drive, varying the throttle from 30 MPH up to 48 MPH for 2 cycles, to make sure all the system tests have completed.
If you get the CEL light again, start with checking the vacuum lines ( old enough truck, might need to be replaced ).
Could be other things, but these are the most common ones.

Jan 04, 2010 | 1999 Ford F150 Regular Cab

1 Answer

My motor will start up run but when it get warm it stulls

Is there any engine lights that come on? Usually a Mass Air Flow Sensor will show up in a code.... Also when was the last time you changed your Oxygen Sensor?

Jan 14, 2009 | 1993 Ford Thunderbird

1 Answer

94 Nissan Truck KA25E engine

You most likely need to replace said Mass Air Flow Sensor (MAFS). If you disconnect this sensor, the ECM uses other sensor data to "calculate" fuel delivery. Problem is, this method is not good for real time- meaning that when you hit the gas pedal, the ECM has to calculate the fuel needed and the engine doesn't rev up right, causing more of a driveability issue.

I've replaced quite a few of these sensors. Be sure to buy a new Nissan air filter when you buy the new MAFS. Even if you do the work, Nissan will want to see that should you have a parts warranty (12 months/ 12,000 miles) claim. No air filter replacement (with a Nissan part) = no warranty coverage.

This is not the most accurate test to use to check the operation of a MAFS, but it usually gives you an idea if you're in the right area- idle smooths when disconnected usually means you are in the right area.

Hope this is helpful!!

Nissan Scope Technician- 10+ years experience in Nissan dealership.

Nov 16, 2008 | 2006 Nissan Sentra

1 Answer

1998 Ford Expedition wont stay running

it is probably the MAFS, the MAFS tells the computer how much air is coming in and if it is bad the ECU will not be able to work properly, it is an integral part of the system,

one way to check the MAFS is to unplug it and try to start the vehicle, if the problem is better then replace the MAFS

Edit: also try to clean the MAFS with brake cleaner, sometimes dirt and oil will cause a MAFS to act up, it may be hard to get to the sensor wires but if you take the MAFS all the way off of the vehicle and just spray the unit down well you should be able to clean any larger debris off of the sensor wire

Oct 02, 2008 | 1998 Ford Expedition

2 Answers

Run hard at 2500 rpm 96 nissan pickup 2.4 5 speed

I had a similar problem mine would hit a rev limiter at 3500 rpms. it would blow black sut out of the tail pipe. Ended up being mass air flow sensor/valorem sensor. almost 500.00 from nissan. fixed it though.

May 31, 2008 | 1996 Nissan Pickup

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