UK Car

UK car repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Yellow light and P0101. Engine Failure. P0101 is a bad Mass…

Customer Question
Yellow light and P0101 ...

Yellow light and P0101

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

Engine Failure. P0101 is a bad Mass airflow sensor.

Mechanic's Assistant: What is the model/year of your Hyundai?

2005 sonata 2,4 GLS Aut.

Mechanic's Assistant: Are you fixing your Sonata yourself? What have you tried so far?

Changed the MAF sensor. The same error. Bad idle,

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The sig nal from The MAF Sensor is 0 Volt.

Submitted: 8 months ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Answered in 10 minutes by:
1/5/2018
UK Auto Mechanic: Mechanic01, ASE Certified Technician replied 8 months ago
Mechanic01
Mechanic01, ASE Certified Technician
Category: UK Car
Satisfied Customers: 4,261
Experience: Owner at Baltic investments
Verified

Hello my name is ***** ***** welcome to just answers! I will be assisting you with all of your vehicle questions today. Give me one moment while I review your question and come back with a answer. Please be aware I do not know your skill level or abilities so I will be asking a lot of questions and in a lot of cases we will respond to each other quite a lot before we find a solution. As far as phone calls are concerned that is the system prompting you, not me, and they do cost more money, I prefer text but in some cases a phone call is required. If I don’t answer right away or quickly in conversation I am helping another customer or have stepped out for a moment and will respond as soon as I can. Ok lets get started!

So this sounds like it may be a wiring issue, I would trace the wire back as far as you can, you will have to cut some tape and loom to follow it back further to inspect of there is any damage to the wires, they like to rub bad spots in them

Ask Your Own UK Car Question
Customer reply replied 8 months ago
Can you tell me what i should messure on the 5 pins that connect the MAF sensor?
I guess that Pin 3 is the output?
UK Auto Mechanic: Mechanic01, ASE Certified Technician replied 8 months ago

https://www.dropbox.com/s/21os1hl3i1zaiov/fri5.docx?dl=0

This will tell you everything you need to know on how to check it

Ask Your Own UK Car Question
Customer reply replied 8 months ago
Thanks for the diagram.
Seems to be at Little confusion. My car is a Hyundai Sonata MK V. 2,4 aut. 2005-2010 engine G4KC. 4 cyl.
UK Auto Mechanic: Mechanic01, ASE Certified Technician replied 8 months ago

yeah if you have 2.4 thats it

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I Have a Air temperature senser mounted between Pin 1 and 5 on my MAF unit.
UK Auto Mechanic: Mechanic01, ASE Certified Technician replied 8 months ago

I guess my document dosent line up ill open this up to the other techs to assist

Ask Your Own UK Car Question
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: UK Car
Satisfied Customers: 24,338
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

If the sensor has truly been ruled out then you do have a wiring issue.

The mass airflow sensor signal wire is in 1, IAT is pin 5. You're not concerned with pin 5.

You mentioned no signal from the MAF sensor but not how that was determined. Can you elaborate on exactly what was done?

Ask Your Own UK Car Question
Customer reply replied 8 months ago
Helo again.
I have a MAF sensor from Siemens with a 5 pin connector.Pin 1 = 0V (common)
Pin 2 = 12V
Pin 3 = 0,01 V
Pin 4 = 0V (common)
Pin 5 = 4V (IAT)I meassure the Volts With a DC multimeter, 5pol plug connected and the engine running.
I get a yellow Engine light on the board and my bluetooth Viecar/Torque tells me that my MAF sensor is the problem.
I guess i should meassure a voltage about 1 - 2 Volt at the output from the MAF sensor.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago
I need to know where the leads were placed when you believed you tested the sugnal.
Ask Your Own UK Car Question
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago
That should say 'signal', I'm unable to edit it.
Ask Your Own UK Car Question
Customer reply replied 8 months ago
I have the plug normally inserted into the MAF sensor unit.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago
But where are you placing test leads?
Ask Your Own UK Car Question
Customer reply replied 8 months ago
If you mean the leads on my multimeter, the Black one is on the negative pole on the battery and the red is the one i use to meassure the Volts.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

And what are you doing with the red lead?

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I am measuring the volts on the Pin 3 of The MAF sensor Plug. The one that I expect to be the output pin.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

Pin 3 is the IAT ground. As I mentioned pin 1 is the mass airflow sensor signal.

Ask Your Own UK Car Question
Customer reply replied 8 months ago
Are you sure you are looking at the correct Electric wiring diagram?
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

I'm looking at the diagram from the factory service information for the vehicle information provided.

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I am in Denmark. Could there be a difference ,
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

There should be no difference.

Ask Your Own UK Car Question
Customer reply replied 8 months ago
5WK9 6491 Siemens 28164-25000 is written on the unit.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

Ok.

Ask Your Own UK Car Question
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

The sensor itself isn't of concern.

Where are you getting this information on terminal placement?

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I can the reach the legs on IAT Thermistor inside the tube with my multimeter, and in the Ohm setting i can measure that they are conected to Pin 1 and Pin 5.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

You don't need to be testing anything with both leads on the sensor.

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I do it because i need to find out where to look for the output of the MAF sensor. I have no diagram.
UK Auto Mechanic: sprinkles08, ASE Certified Technician replied 8 months ago

Two of us with a diagram have attempted to help, and it appears the first person supplied you with one. The MAF signal wire is pin 1.

Ask Your Own UK Car Question
Customer reply replied 8 months ago
I am sure that Pin 1 and Pin 5 are for the IAT Thermistor.
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an uk auto mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: UK Car
Satisfied Customers: 24,338
24,338 Satisfied Customers
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

sprinkles08 is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Marty

Marty

European Car Expert

432 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

Greg

Greg

Shop Owner

1,367 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

627 satisfied customers

12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified

Matt

Matt

Mechanical Engineer

4,709 satisfied customers

BEng hons Mech engineering, in auto industry 22 years

Trevor

Trevor

UK Car Mechanic

853 satisfied customers

NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician

Rob

Rob

UK Car Mechanic

823 satisfied customers

city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan

martin jones

martin jones

UK Car Mechanic

646 satisfied customers

25 years as a mechanic and mot tester, owned own business for 10 years city and guilds trained

< Previous | Next >

Related UK Car Questions
My BMW 528I 1997 e39 will not start When the brand new mass
My BMW 528I 1997 e39 will not start When the brand new mass airflow sensor is hooked up … read more
Danny
Danny
Owner, lead mechanic
High School or GED
4,663 satisfied customers
I got a chev Silverado 2007 keeps giving me a p1010 error
Hi I got a chev Silverado 2007 keeps giving me a p1010 error and clean exhaust filter I have changed the airmass meter , checked wiring , checked for air leaks and vacuum can't find anything wrong wit… read more
sprinkles08
sprinkles08
ASE Certified Technician
High School or GED
24,338 satisfied customers
I have got vauxhall astra 1.9 cdti 120 bhp sri, i have got
Hi, i have got vauxhall astra 1.9 cdti 120 bhp sri, i have got two error codes. P112521 and p063804, throttle body valve is open even if the ignition is off. I cleand the maf sensor posibbly i have da… read more
Merc320
Merc320
Highbury College
358 satisfied customers
I'm not sure if you see the question somebody else had that
I'm not sure if you see the question somebody else had that I'm looking right now but I have similar kind of problem and you asked if any other warning lights illuminated and yes they are for me after… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I live in Johannesburg - South Africa and have a 1999 Opel
Good day, I live in Johannesburg - South Africa and have a 1999 Opel Astra CSE 1.8 16v. You have assisted me in the past with the engine light that kept coming on. You solved it where the local guys c… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,367 satisfied customers
Volkswagen 2.8 v6 4motion: Right got a v6 4motion got 3 errors
Right got a v6 4motion got 3 errors on ecu, one is maf one is throttle response one is 02 sensor they all say low circuit, changed maf still not any better, traction light comes on with epc and manage… read more
Wolfgang
Wolfgang
14 satisfied customers
Peugeot 807: Hi, I have a Peugeot 807 2.0HDI 2004 model. For
Hi, I have a Peugeot 807 2.0HDI 2004 model. For the last couple of years it has been unstable. Sometimes it looses power for a short period of time and regains power again the next second, looses it a… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
c max: hi im trying to sort out this problem on a ford c max
hi im trying to sort out this problem on a ford c max 16 tdci 2006 ,it was smoking alot after starting from cold so i looked for codes and i ve found code p 138b glow plug control module system volage… read more
sean
sean
Ford Master Technician
Vocational, Technical or Trade Scho
1,348 satisfied customers
thunderbird: I have a 95 ford thunderbird with a rough idle,
I have a 95 ford thunderbird with a rough idle, I chek the maf at the connector and everithing was ok , but the #1 wire, it suppose to have .60 volt at idle and it has 14.3 volt… read more
sprinkles08
sprinkles08
ASE Certified Technician
High School or GED
24,338 satisfied customers
Volkswagen Passat 1.9 TDI. 130 brake: Hi there.I have a problem
Hi there. I have a problem with 2004 passat 1.9TDI 130 brake. Car goes into limp mode a lot. Check engine light constant on. Any time you go over 80MPH it goes to limp mode but resets with the key. Lo… read more
Wolfgang
Wolfgang
14 satisfied customers
. have a toyota lucida 95. idle has been a bit rough. white smoke too.
hi. have a toyota lucida 95. idle has been a bit rough. white smoke too. serviced the motor. was still smoking. changed the injectors. idle got better. changed the glow plugs idle got worse. found tha… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,367 satisfied customers
HI, I HAVE 1999 a140 1.4 PETROL..FAULT CODE..OIL LIGHT..STARTER MOTOR
HI, I HAVE 1999 A140 1.4 PETROL, HAD IT TESTED AND IT CAME UP WITH FAULT CODE P0121, LISTED AS THROTTLE POSITION SENSOR. I HAVE CHANGED THIS POSITION SENSOR BUT THE FAULT OF LOSING THROTTLE AND OIL LI… read more
Stan
Stan
Technical support engineer
Bachelor's Degree
106 satisfied customers
Suzuki Vitara I have replaced the Mass Air Flow Meter 3 times
I have replaced the Mass Air Flow Meter 3 times now on my 1600cc multi point injection Vitara Soft-top. Each time it has run well for a few months before starting to hesitate again backfire and cut ou… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,367 satisfied customers
Honda: The yellow engine management light come..rough..gets warm
I have a honda CRV on 03 plate. The yellow engine management light come on before start up. When you start the engine, it ticks over at 1200 rpm and sound rough/missing. When the engine gets warm and … read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,709 satisfied customers
Idle the revs keep going..stalls..changed plugs..coil
in idle the revs keep going up and down and some times stalls after running for a while it seems fine have changed plugs leads and coil any ideas please… read more
Trevor
Trevor
UK Car Mechanic
Vocational, Technical or Trade Scho
853 satisfied customers
wiring on a Transit 2.0 di 01 duratorq maf sensor..12 volt..ecu
Hello there, i'm trying to sort out the wiring on a Transit 2.0 di 01 Duratorq MAF sensor, i have 12 volt switched power 2 earths and a 5 volt supply... can some one tell the ECU return wire please?… read more
Davie
Davie
Vocational, Technical or Trade Scho
202 satisfied customers
Jaguar xjs: 6 cyl... wouldnt start.. you..runs fine..idles..smooth
for rip....95 jaguar xjs 6 cyl... wouldnt start.. you said put marvel oil in cyls.. now it starts and runs fine untill warm... then it runs rough, wont take gas.. pops and backfires when you try.. plu… read more
RIP
RIP
Lead Technician/ JA Car Category Mentor
High School or GED
452 satisfied customers
1995 JAGUAR XJ6: 000 MILES..CHANGED PLUGS..A LITTLE HESITATION AT IDLE
I HAVE A 1995 JAGUAR XJ6, GOT THE ENGINE FROM JUNK YARD W/60,000 MILES CHANGED PLUGS AND ENGINE SEEMS TO HAVE A LITTLE HESITATION AT IDLE AND WHEN LITTLE GAS APPLIED.PLEASE HELP… read more
RIP
RIP
Lead Technician/ JA Car Category Mentor
High School or GED
452 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x