Mercedes

Have Mercedes Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Mercedes
This answer was rated:

I own a 2012 Mercedes C250. I have a service light on but…

I own a 2012...

I own a 2012 Mercedes C250. I have a service light on but can not get a scanner to scan it because my OBDII port doesn't power up any scanner.

Mechanic's Assistant: Do you have the trouble code? Do you have a code reader or scan tool?

Read my script

Mechanic's Assistant: I'll pass this info along to the Mechanic so that he can get you a quick fix. Are you fixing your C250 yourself? What have you tried so far?

Scanning with different scanners. Same problem. Checked the OBDII port for 12 volts. No power detected.

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

No I will place a $5 fully-refundable deposit now.

Show More
Show Less
Ask Your Own Mercedes Question
Answered in 6 minutes by:
1/19/2018
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54,754
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified

Hi, my name is***** you post the last 8 digits of your vin number for me?

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
CR216836, and the engine sounds like a diesel for about 3 seconds most of the time when you crank it. It was when it started this rattling noise that the service engine light came on.

Ok, it sounds like you have some valve timing problems with the clatter on startup. Possibly a worn timing chain or chain tensioner or a noisy camshaft adjuster. Fuse 73 in the rear fuse box powers the data link connector. Check that fuse and see if it is blown.

Let me know what you find.

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
I have check every fuse (under the hood and in the trunk) with a 12 volt test light. There are no bad fuses, anywhere.
Customer reply replied 1 month ago
Okay. I will check fuse 73. What else is weird, is that the rattling sound doesn't happen all the time, only about 2/3 of the time. The engine has all of the service records, has been well maintained, and has only 80K miles on it.
Customer reply replied 1 month ago
It is late here. I will check the fuse and get back to you tomorrow. Thanks.

Ok, I'll be here if you need anything.

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
Okay, got a code P0340.

A P0340 is usually going to be caused by a faulty intake camshaft adjuster or timing chain tensioner. I usually replace the adjuster, chain and tensioner for this code.

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
The chain sounds like a major job. The car has 80,000 miles on it. The other components sound like a minor job. Am I right?

I break the chain and wind it in. Neither repair is all that difficult but you will need the tools to break the chain and rivet it back together.

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
Should I dismiss the possibility of a faulty sensor or bad circuit?

Yes, it's not a sensor fault.

Ask Your Own Mercedes Question

Let me know if you need anything else. Please remember to rate my service in order for the website to credit me for helping you.

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
Will I require a special tool to hold the cams or can I work around that?

You're going to need the holding tool.

Ask Your Own Mercedes Question

Just checking in. Do you need any more help with this question?

Ask Your Own Mercedes Question
Customer reply replied 1 month ago
I think not. I just have to get in there and do this thing. I work during the week and can work on my car only on weekends. Thanks.

Ok, I will be here if you need anything. Just let me know.

Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54,754
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified
Marty and 87 other Mercedes Specialists are ready to help you
Ask your own question now
Was this answer helpful?
Ask Marty Your Own Question
Marty
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54,754
54,754 Satisfied Customers
Experience: Bosch Certified Master Tech. Over 35 years experience.

Marty 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:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

54,754 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

3,771 satisfied customers

15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,131 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

602 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
I am considering purchasing either a 2014 MBZ C250 sedan or
I am considering purchasing either a 2014 MBZ C250 sedan or a 2015 C300 4MATIC sedan. Both are CPO vehicles. Is one of these vehicles more reliable than the other? Which would you recommend for long t… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
I am considering purchasing either a 2014 MBZ C250 sedan or
I am considering purchasing either a 2014 MBZ C250 sedan or a 2015 C300 4MATIC sedan. Both are CPO vehicles. Is one of these vehicles more reliable than the other? Which would you recommend for long t… read more
Wolfgang
Wolfgang
3 satisfied customers
My 2014 c250 has the keys locked in the trunk. Have access
My 2014 c250 has the keys locked in the trunk. Have access to engine and the interior. Any suggestions … read more
Daniel Lee
Daniel Lee
Lead Automotive Technician
Automotive Technology
34 satisfied customers
Engine light came on a couple days ago on my 2012 c250
engine light came on a couple days ago on my 2012 c250 turbo . we took it in to a mb repair shop and they say the cam shaft adjuster is the problem and they need to pull the top part of the engine off… read more
Wolfgang
Wolfgang
3 satisfied customers
I own a 2012 Mercedes C250. I have a service light on but
I own a 2012 Mercedes C250. I have a service light on but can not get a scanner to scan it because my OBDII port doesn't power up any scanner. … read more
Marty
Marty
Mercedes Technician
54,754 satisfied customers
Mercedes c250, low beam passenger side is not working, buld
mercedes c250, low beam passenger side is not working, buld replaced and fuse checked but still not working, H7 xeon bulb … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I have a 2012 Mercedes C250. recently got numerous warning
I have a 2012 Mercedes C250. recently got numerous warning lights on dash, ESP, ESP off, check engine ABS. additionally, I get the ABS / ESP inoperative - see operators manual warning. also the cruse … read more
rpmdiag
rpmdiag
High school
7,339 satisfied customers
2010 mercedes C250 front seat heaters not working. both
2010 mercedes C250 front seat heaters not working. both lamps iluminate for 10 seconds and prove out … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I have a c250 that's due to return on 10/31/17; I had an
I have a c250 that's due to return on 10/31/17; I had an inspection and they found few things totalling $1,000 plus I have to pay $600 for lease deisposition; I don't want to get mercedes anymore but … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Reset service message on. 2011 c250. No parked car for
no parked car for summer using it now every time i start car service exceeded 180 days … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Im hacina. 1994. Irse ac250. Ts a c250 diesel. Its pretty
Hi JA: Hello. How can I help? Customer: Yes JA: What is the make/model/year of your car? Customer: im hacina JA: What year is your Mercedes? Customer: 1994 JA: Are you fixing your vehicle yourself? Wh… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I have 2 different problems on my 2012 mercedes c250 coupe.
hello i have 2 different problems on my 2012 mercedes c250 coupe. First the steering wheel height adjustment not working it is stuck in the highest position it makes a clicking sound when trying to ad… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I have a 2012 c250 (64k miles) that's rattling on start up
I have a 2012 c250 (64k miles) that's rattling on start up and having difficulties cranking. When cranked the engine makes a subtle tapping noise that sounds like it's coming from the valve train. I p… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
My 2013 c250 left me stranded on the road. My battery is
My 2013 c250 left me stranded on the road. My battery is totally dead, not even could a tow truck get my vehicle to run. My question is , once I replace the battery does I he vehicles computer have to… read more
Marty
Marty
Mercedes Technician
54,754 satisfied customers
I was looking at a used 2014 c250 and the carcass said the
I was looking at a used 2014 c250 and the carcass said the transmission had been removed and reinstalled. Why would that be done and is it a red flag to not buy this vehicle? … read more
Mechanic01
Mechanic01
2,019 satisfied customers
Got 2012 mercedez benz c250 first every time is cool make a
hi got 2012 mercedez benz c250 first every time is cool make a bad noise on the front of the engine we take to the mercedez benz dealer and found the camshaft actuator make some noise the exhaust im a… read more
Merc320
Merc320
Highbury College
358 satisfied customers
I have a 2014 c250 I just got a message that says instt.
I have a 2014 c250 I just got a message that says instt. cluster lights vehicle factory setting what is this asking for or what does it mean … read more
Gunvir Singh
Gunvir Singh
1,888 satisfied customers
I have a 2013 C250 and I that has navigation but does not
I have a 2013 C250 and I that has navigation but does not have satellite radio. Can I add the SIRIUS SATELLITE RADIO MODULE FITS 11-15 MERCEDES BENZ SLS DL4490 A2128706489 … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 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