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HOW TO KNOW IF MAF SENSOR IS BAD. MASS AIR FLOW SENSOR TEST

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HOW TO KNOW IF MAF SENSOR IS BAD. MASS AIR FLOW SENSOR TEST
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Engine light is often triggered by bad or dirty MAF sensor also known as Mass Air Flow Sensor. In this video we will demonstrated how we tested the MAF sensor on this BMW to see if it is good or bad. Bad sensor will not be responsive, dirty sensor will have limited or slow responsiveness.
We demonstrated how to test the MAF on this BMW but the procedure will apply to most modern cars with OBD connection.
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24 авг 2024

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Комментарии : 121

@AutoRepairGuys 5 лет назад

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@ryans413 4 года назад

I just want everyone to know if you pull out your sensor and it looks clean don’t take it as it’s fine. Mine was bad and I used mass air flow cleaned sprayed it little dirt cam off plugged it back in and the car worked great. These sensor are supper sensitive

@CORNHUSKMCGRAW 4 года назад

I agree with you, Straight to the point. Even if it looks clean still spray it with cleaner..

@brendacalderon9445 Год назад

@@CORNHUSKMCGRAW used almost my whole can and it didn't fix it so Bought new sensor and still didn't fix it ugh

@caporal888 8 месяцев назад

@@brendacalderon9445 then, my friend, the maf sensor isn't the problem.

@josevera169 6 месяцев назад

@@brendacalderon9445im having that same problem right now man

@marchanv1 6 месяцев назад

@@brendacalderon9445same problem here. Even replaced sensor and still not fixed. What was the final diagnosis for you?

@josepeixoto3715 3 года назад

Good info,and yeah,but still it can be a number of things,not that simple; if the EGR is acting up,the intake air dilution is upset and the maf gives bad readings; same if there are problems in the wiring or in the connectors; seen LOTS of MAFs changed with new ones,and ,the problem remained until the bad connections were fixed

@procatprocat9647 Месяц назад

Hi, I appreciate your comment! My maf output never changes on the scanner log. It's always at 8 kg/hr irrespective of rpm. I also bench tested it with a vacuum and the output never changes. Bad sensor confirmed? Or should I trace all connectors and look for a fault before paying out £100 for an oem part? Cheers! Edit to add - the filter got soaked a month ago. The scanner gives a p0102 code which immediately returns after clearing

@rickardomoses120 6 месяцев назад

thank you very much you are a fantastic teacher..I am a first time learner and fixed my BMW 320D 2010 modle all with just watching your vedios. the mechanics wanted 6k to fix my car .. i did it with less than a thousand dollars..

@KIAPETE1911 3 года назад

With the engine off does the MAF give a read out? when my engine is off its at 0.0, my dads car reads 0.6 with the engine off. so wondering if there is an issues?

@Therey1898 2 года назад

You should make videos using that scanner on bmw for different things i have the same one but i only use it for codes

@cesarcalderon2499 2 года назад

Hehe he talks like he is holding up his breath. Nice tutorial!

@dzwonik 3 года назад

Thanks mate i found it. its a maf sensor caused higher fuel consumption! You are the best G!

@sencanboz2645 3 года назад

It shows almost no time lag, that's great!

@oeungmao1 3 года назад

Can you do video of how a second AIR system completed on 97 bmw 328i

@nilhansilva4799 2 года назад

Whata the correct value in 4 cylinder engine air flow sensor in g/s.

@vjxpiroevo9263 3 года назад

I have my truck with p0102 MAF sensor ,but when I put the scanner Maf graphics won't move only said 0.20lb

@farhan7269 5 лет назад

Plz make video on oxygen sensors

@philojalvo5368 3 года назад

after replacement, do i need to reset the new sensor in my 2013 335i ? or will the car automatically detect that the faults have been corrected?

@shark70007000 Год назад

I don't have a code for MAF, but this 2005 Nissan Altima is only showing 0.01 to 0.16 lb/s. It starts cold, runs up in RPM's, but as you drive it, it looses power and slows down, almost to a stop. But I have no codes for the MAF.

@walther89 3 года назад

mine at idle fluctuates 12-16 and give a gas fast about 5k rpm it shows 330 kg/h it broken then ?

@evelynintrance 2 года назад

My value is 16 kg/h at idle. On a grand vitara 2007. Does this look ok?

@cbsflows1041 3 года назад

And what if it climb and drops a little when bump up the throttle? Im not play with the throttle but just go up, up ,up until i hit 3000rpm but the value dropped sometimes.. i think i lose some power from 1000rpm and 3000rpm when drive in second gear..

@sweetsuductress 5 лет назад

Great video...taught me how to use the graphing on my maxidas as well as how to diagnose a maf 👍🏼

@buellakas 5 лет назад

Hi. Nice vid. I am looking for scanner for my bmw e60. Can you tell me if your scanner can read and show adaptation values on the automatic transmission clutches? Can it read live data on fuel injection system,like injectors etc? Many thanks.

@americanpatriot5836 3 месяца назад

Great video

@MohamedTarek-qm3vf 2 года назад

I have BMW f30 N20 and I want to check is my maf is bad, when I unplug it while it’s running should it stop or continue running ?

@DavidMoralee 3 года назад

I have a 4007 Peugeot, runs great without MAF plugged in, but when plugged in, the car will occasionally misfire at around 2000 revs. No codes? Any advice?

@alp6181 2 года назад

New Maf

@RBPD92 2 года назад

I am having the same problem like you, but with a Suzuki Vitara, what was your problem? Thank you David.

@arnolduk123 4 года назад

Battery Voltage 14.0 mV ? That's waaaay too low :) Thanks for video.

@mainrig4981 Год назад

what is the difference between maf with temperature sensore and one cheaper but without temp sensor

@grizzlybullz7723 3 года назад

What does it mean when MAF sensor reading 0 at idle ?

@leonardochara 3 года назад

no entendi, el ejemplo del video muestra que el maf esta defectuoso porque tarde en responder la señal?

@saywhat6085 3 года назад

Help.. P0174 Long fuel trim in the 20s +

@vasilbachev6592 3 года назад

Check for vacuum leaks first.

@matt-matt461 3 года назад

My 120d is showing 50 kg/h at idle . This is a stage 1 and i dont know what it showed before that. Is this normal?

@DjordjeSrpski 2 года назад

same, what did you do?

@UniqueMercenary 3 месяца назад

same, what did u guys do to fix it?

@victorreyes2135 4 года назад

Beast mode 💯 scanner

@MrTorino619 2 года назад

Great job!

@ishmaelchibvuri 5 лет назад

Awesome video

@oqhr Год назад

Hello I have 2020 hyundai elantra with 2.0 engine. The car is shaking hard on the morning. I check the computer and I found that the (mass air flow) does not change when I increase the throttle. The issue is that my car doesn't come with (mass air flow sensor) from factory, so what should I do solve my issue

@harpindersingh7197 Год назад

At idle my n52 shows aroudn 21-22 kg/h. So is it ok or it’s faulty?

@user-du2pw6sg1m 3 месяца назад

Hello friend I bought a new air sensor and after connecting it, the car became shaking, and while pressing the accelerator pedal, there is no torque in the car, after that, the car stopped working, my friend, does the new sensor need programming??

@-ro-whatisthat6129 2 года назад

hi there. I have a Bmw 520d f10 and and I have the Engine light in the dashboard. I put the tester and it said...faulty code P115d. the MAF sensor is ok, what could be? thanks

@stanley4089 Год назад

Hello sir I'm new to this I have ford f-150 5.0L 2013 it hesitates an shows code for mass air flow sensor P0113 circuit high input an IAT P0102 circuit low input an on scan tool mass air flow sensor reading is 2.36 -2.36 no changes Any help is highly appreciated

@Sandrokenchadze1700 4 месяца назад

hi my is 8.6 kg/h reading is it bad?

@matthewmorrone883 2 года назад

When i check MAF value i look at the Grams/second. 2l8ter shouldnt draw any less than 2g/s a 5liter engine, no less than 5gs/s. If the value is less the pcm grounds the injectors less and this not feeding the engime enough fuel for the actually present. Thats my rule of thumb.

@makululaj86 Год назад

Hi Mathew, My 2.2 diesel engine is idling 1.5-1.6 g/s . I can feel loss of power, what can be the issue?

@matthewmorrone883 Год назад

@@makululaj86 mass air flow sensor dirty or reading incorrectly.

@dgoldman2846 4 года назад

Gargle with Salt........helps for sore throat

@mammutit 5 лет назад

this is not the correct way to test a maf sensor, you must compare short term and long term fuel trim in comparison with the maf sensor, that is what tells you whats actually going on

@luismejia2515 5 лет назад

Can a bad maf give you a misfire code.. Or multiple misfires

@costelariton9864 5 лет назад

@@luismejia2515 only the coil or the spark plug can give missfire, your car îs chipped?

@bigreddaman5988 4 года назад

@@luismejia2515 yes a bad maf can cause mifires

@Jaimelev0329 4 года назад

My maf is at .02% . I get p0171 and p0174 error codes. Can those codes come the maf reading that low?

@levanigabedava5299 3 года назад

how many voltage is perfectly w208 3.2 on M.A.F?

@TheGeno2001h 3 года назад

Hello my friend in my Chrysler town and country showing 0.01 and when I accelerated go up to 3 to 9 can you please help thank you

@mrt4409 5 лет назад

My car is starting with a rough idle and maf reading at idle shows it jumping from 9 to 13 then back to 9 to 6, no engine light what does this say about the maf?

@stonesthrow420 4 года назад

If you buy a new MAF...you MUST get a VDO or Seimens brand. Any other cheap knockoff version will give you bad readings. I purchased a replacement MAF sensor from Autozone, yes.... I know better, but I just wanted to try it out. Sure enough, the kg/h was reading 16 at idle. I noticed yours is reading 12.5 or 13kg/h at idle. So my X5 has the 3.0 Litre M54 motor. I have NO vacuum leaks whatsoever and have installed an oil catch can with a new PCV valve. It runs great when you are cruising around, but after warming up and sitting at idle..this DuraCRAP Sensor from Autozone reads that there is much more air coming in than what is actual. If you buy a new MAF...you MUST get a VDO or Seimens brand. Any other cheap knockoff version will give you bad readings.

@ewsconstruction6421 4 года назад

stonesthrow420 Thanks

@Gripen85 4 года назад

Correct me if I'm wrong but I think Pierburg is also a respectable brand.

@gnomebmw 3 года назад

100% agree! I tried a aftermarket MAF that appeared to be good quality, but my car ran much worse the warmer it got, and lean codes. Waste of money. The OEM MAF or VDO part works best although more expensive.

@arnolduk123 3 года назад

@@gnomebmw Cheap MAFs cause problems with error codes, they cannot respond quick enough to air flow changes. I installed a cheapo $15 MAF and started throwing errors after 50Km of driving. Had to keep reseting DME but it worked better than my faulty MAF and $15 is nothing for an engine part. NO WAY paying $350 for a piece of plastic and a wire.

@gnomebmw 3 года назад

@@arnolduk123 My new VDO is still running perfectly in my E46 M54 with 256,000Km on it. Fyi for clarity, some MAFs are more sophisticated and cost much more. For example mine has 6 pins and has an integrated Intake Air Temp sensor which is also critical. On later years the sensor was relocated from intake manifold to the MAF unit. Thus my VDO MAF was $480 Canadian but worth it. No codes and fuel trims are great.

@zakkhan410 4 года назад

E90 320i no fault codes scanner reads 0kg/h value and graph is dead straight line on acceleration. Car runs good but wondering if MAF is bad might improve mileage with new one? Is Bosch sensor any good ?

@arnolduk123 4 года назад

Could be the connection or wiring, check that first before the wallet. No reading seems more like wiring or connector as even bad sensors have some kind of reading. Engine will run without a MAF using default mappings.

@joker8541 2 года назад

My car vw 2.0tdi air mass 7g/s is it bad or no?

@mummaistvan7320 Год назад

6 cylinder MAF 3.4g/a to 5 g/s ?

@Deny_Cappuccino Год назад

I have e bmw e92 4 cylinder engine I have no check engine lite from time to time a get a misfire on Cylinder 4 I changed the Spark plugs the Coils But no result it does it again and what I noticed is the exhaust is always black what can be the problem ? 🤷🏻‍♂️

@mummaistvan7320 Год назад

I Have same , P304 ! #4 cyclinder misfire. Spark plugs, ignition coils, changed as well. I needed new o2 sensors, EGR valve. My purge valve was good. I'm thinking since I've cleaned my maf sensor twice, that will possibly be next. Hope this helps you.

@vocem_dei5365 4 года назад

Мужик, если б ты на русском говорил -цены б тебе не было)))

@stanleypierre_louis2308 4 года назад

Hey guys I am having an issues with my e90 so long story short my 06 e90 sat for a good year or more didn’t want to start so I noticed that the wiring harness need to be change crank sensor relays battery has been changed so after we put it back together I got it to try to start but nothing just a click I think the starter is no good my buddy said he thinks it’s the computer I had a technician check the car no answers with more money our the pocket in short I need help plz

4 года назад

What if yuo have BIG vacuum leak ?

@spachuladgaming651 3 года назад

Car would not idle and will shut off

3 года назад

@@spachuladgaming651 only if its big , but with smaller leak fuel trims will fix rhis. Before testing MAF fuel trims need tol be check first

@evaldaszmitra7322 5 лет назад

0 for MAF regardless of throttle pos. I use elm327 with an app, reads all values fine, but maf is 0 on 320i e90. No check engine lights but couple of problems: Started on a 2nd attempt when hot after 300km drive. Cold rmp sits at 1k then drops to 700 idle when warm, keeps within 650-850 idle range. Chokes when full throttle at lower rpm. Runs better if throttle is applied gradually. (Electronic throttle shouldn't do that). Acceleration isn't very, good, but done a top speed test and it went all the what up as it should. Uses about 1l/100km more fuel than it should. No CEL or stored codes. Could it be that ELM327 isn't reading maf?

@zakkhan410 4 года назад

Efka e did you sort out the problem ? My MAF also reads 0 value and straight line graph regardless of acceleration. Car runs fine no codes but I am keen to know why MAF is reading 0

@evaldaszmitra7322 4 года назад

@@zakkhan410 O2 sensors were going out. Sadly got rid of the car - later I got a timing chain issue, really expensive to repair. E90 generation 4 cylinder engines are plagued with them. For that generation only 328i and 330i are quite good. Newer BMWs are much better in terms or reliability and power.

@amjit31 4 года назад

@@evaldaszmitra7322 which o2 sensors were messed? Planning to fix this myself

@amjit31 4 года назад

@@zakkhan410 did you figure this out yet?

@zakkhan410 4 года назад

aj I replaced the entire cat converter after market OEM brand new BDM brand and replaced all 4 sensors genuine but car still throwing codes cat efficiency bank 1 and 2 threshold low bullshit. Car runs perfectly just get the check engine light after every 200 Ks or when I drive on freeway for a longer period. Now I just erase the code with scanner and keep driving it not worth fixing and spending money on this piece of shit engines

@KimVonKonk 5 лет назад

Hi! Can you also reset the maf values with that MaxiCom?

@Gripen85 4 года назад

MAF is live data... I don't think you can or should reset any values?

@julianperez-robles6921 4 года назад

I have a 2002 Lincoln LS 3.0 MAF reading 0.01lb/s at idle and when I gave it gas it do go up but is the 0.01 lb/s idle too low or is that good?

@sanchfire 4 года назад

i have the same issue...on 2012 Buick Lacrosse ... P0172 obdII code (system too rich bank 1) no vac leak...

@julianperez-robles6921 4 года назад

R San I have a system too lean bank 1 it switches to rich to lean I’m thinking 🤔 pcm needs a reprogram or cats or clogged

@MarkbromIerski 4 года назад

Are you the guy from motomadness? You sound just like him 😂

@luciano5137 3 года назад

Best way turn ur car on unplugg maf if car stays on bad sensor needs replacing no need for bs

@ferrumignis 2 года назад

_"if car stays on"_ This is BS, the engine can still run with a bad sensor plugged in, but may cause hesitation or surging.

@Ethical_X-ploit 2 года назад

@@ferrumignis My MAF sensor reads almost the limit value of air mass, but the car is actually parked. It reads something like 597 mg/stroke ... l'm talking about a RIDEX cheap MAF sensor. I bought It from Autodoc ( 28€ ). Is the MAF sensor related to the turbocompressor ? Which brand do you suggest me to buy ? Bosch ? Do I have to program the Bosch MAF sensor which serial code ends with 527 ?

@jorarr5174 3 года назад

And if it dosent move at all

@inherentinsight5856 3 года назад

Man, can I pick your brain? I need some words of wisdom. We have an 06 Audi A4 2.0t Quattro, it started to have a misfire, I changed the coil packs and plugs, didn't fix the misfire, I changed the PCV valve, the purge valve, new alternator, new battery, and this didn't fix the misfire. I've brought the car to two mechanics and they couldn't identify the issue, now the car has a misfire in cylinder 2 and 4 and random misfires. Any suggestions?

@NightmareonAnyStreet_ Год назад

Don't knw If u fixed the problem or still have the car but when my old audi had those same problems u mentioned it was my fuel injectors. Got those replaced fixed the car and sold it so fast 😂😂

@gmoneyga84 5 лет назад

I've been having an issue with my car on warm days --the other day car started and then stalled - would not restart--I unplugged the MAF and the car started up--does this automatically mean the MAF is bad?

@TaijiArban 4 года назад

Not really. Could be a fuel or throttle body for all I know.

@tr888unruly7 3 года назад

My engine keep pop up I jus got car from dealer. BMW i5281 2012.

@tykendrick800 4 года назад

My kg/h jump between 14-16 no a/c or radio. And jumps between 24-29 with a/c on. My graph is all over the place. No cel now but I'm sluggish and can't spin a tire if I wanted

@DjordjeSrpski 4 года назад

couple of things could be happening, probably Mass Air Flow Sensor, dirty EGR and dirty DPF. In case your car is not getting good temperatures then its for sure the reason why this is all happening. I would check how fast your working temperatures is getting and if its slow then check with thermostats, start from the cheapest parts then push further. If you car can't spin a tire hard then its probably in limp mode cause of bad dpf and egr.