How JustAnswer Works:

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

Ask Jake Your Own Question

Jake
Jake, Technician
Category: Audi
Satisfied Customers: 2398
Experience:  Over 30 years experience, 17 years with Audi, Factory trained
9204914
Type Your Audi Question Here...
Jake is online now
A new question is answered every 9 seconds

Diagnose cam sensor failure symptoms

Resolved Question:

diagnose cam sensor failure symptoms
Submitted: 5 years ago.
Category: Audi
Expert:  Jake replied 5 years ago.

Hello Bing,

 

Thank you for choosing "Just Answer" for your query. Yes, I can help you.

 

The "Check Engine" light or MIL (Malfunction indicator light) illumination, indicates a problem in the engine control system.

 

A steady light indicates a fault that may cause high engine or evaporative emissions. Under certain conditions the light will blink or flash. A blinking light indicates a severe level of engine misfire that can cause expensive component damage.

 

If the MIL is flashing, I advise you DO NOT drive it. Misfires on this year/model/engine are common. The most likely cause would be a coil. They are located under the black plastic cover on top of the motor. If it is a coil, they are fairly simple to replace and relatively inexpensive. I usually recommend replacing all 4 coils. If you want to take a chance you could simply replace all coils, but it may not correct the fault. There are other possibilities, but without ALL the specific Diagnostic Trouble Codes (DTCs), a description of the symptoms, when they occur, and how they developed, this is just a guess based on your description as this is BY FAR the most common cause of misfires and the storing of the P0300 series of DTCs.

 

Why is it that you susspect the cam sensor failure?

 

If the MIL is flashing, it's a pretty safe bet the coils will do it, but no guarantee's. I rate it a 3 on a 10 scale for difficulty to DIY replace.

  • Remove the plastic cover on top off the motor
  • Disconnect the electrical connectors at the coils. Be careful you do not break the little tabs that hold the connector to the coil
  • Gently pry up/out the old coils
  • Replace in reverse

 

The MIL will still be illuminated and must be cleared with a scanner. It should go out by itself, but it may take awhile. If it is still running poorly or flashing, there is another problem and further testing would be required.

 

I hope I have answered your questions and addressed your concerns. Should you have any further questions, please do not hesitate to ask.

 

Positive feedback, referrals and bonuses are always APPRECIATED! If you accept MY answer please click on the "ACCEPT" button by THIS answer.

 

Thank You!

Jake "THE AUDI DOCTOR"

 

 

 

 

 

 

 

 

Customer: replied 5 years ago.
Also, I have a engine code PO340 which corresponds to cam sensor performance. Do you still suspect the coils are causing the misfires or in fact is it the coils?
Expert:  Jake replied 5 years ago.

P0340 is for no signal from the cam position sensor. This is located on the front of the engine under the timing cover. You should see the electrical harness connector going to it. A failure or intermittent failure of this sensor could cause a "no start" issue, but could not be the cause of a misfire.

 

What are ALL of the DTCs you have retrieved?

 

Jake

Customer: replied 5 years ago.
PO340,301,302,303 & 304
Expert:  Jake replied 5 years ago.

Is the vehicle misfiring?

 

Is the check engine light flashing?

 

If you clear the DTCs, do they come back?

 

Thanks!

Jake

Customer: replied 5 years ago.
Misfiring -yes
Solid engine light
Codes come back after clearing
Customer: replied 5 years ago.
We bought the car used. Are there any recalls?
Expert:  Jake replied 5 years ago.

I will post this again as I do not see my last answer.

 

If the light is not flashing the misfire is not that severe and likely not a coil(s). Also, if all the P0300 codes are set, all the coils would likely not fail at the same time.

 

If the P0340 comes back as you state, I would inspect the wiring to the sensor, as well as the cam adjuster/tensioner located on the back of the cylinder head. If the wiring looked good, you could try replacing the sensor at the front of the cylinder head, but I can not guarantee that this will correct the issue.

 

Further diagnosis would require a VW/Audi scanner capable of accessing the various measuring blocks, and performing some system checks. Is your scanner one of these or simply a read codes and erase scanner? It also becomes much more complicated and I would recommend at that point to take the vehicle to a qualified repair shop that is familiar with the system.

 

There were some recalls on coils some time ago on the coils, but most have been performed by now. You can call Audi with your vehicle identification number at 1-800-822-2834 (AUDI), Mon-Fri, 8 am to 8 pm, Eastern Time. They can tell you if there are any outstanding recalls on your vehicle.

 

Thank You!

Jake

Customer: replied 5 years ago.
Cleared codes x2 & both times only PO300/303 & 304 came back and flashing engine light?
Expert:  Jake replied 5 years ago.

No P0340?

 

It could very well be 2 coils, you could swap #3&4 coils with #1&2 and see if the misfire moves. These coils are very sensitive to failure if they are not gently/evenly removed so go easy, If you have a failed coil, I recommend replacing all 4.

 

Jake

Customer: replied 5 years ago.
First I moved coils around and got P0300, 302 & 304, then cleared codes, then I swaped 1 with 4 and got codes P0300, 302 & 304.
Customer: replied 5 years ago.
Pulled plug 4, gapped, cleaned and checked resistance, which was good. After that, reset computer and came up with 300, 301, 302 & 304. Smoking badley. Could this be an internal problem with the engine such as head gasket. But plug 4 showed no signs of leakage, should I check the rest of the plugs?
Expert:  Jake replied 5 years ago.

The vehicle is smoking badly? When did this start? It is very difficult for me to help you if you do not tell me EVERYTHING. The quality of my answer depends HEAVILY on the quality of your description. Please start at the beginning and tell me EVERYTHING to the best of your ability. I will go over your description and give you my answer.

 

BTW, if it's smoking badly remove the large intake boot at the bottom of the intercooler. If there is oil collecting here, your turbo oil seal has failed, and the turbo requires replacement.

 

Thank You.

Jake

Customer: replied 5 years ago.
Yes, it does look like it is the Turbo after all. Will I still be able to ask you questions, as I continue my repairs?
Expert:  Jake replied 5 years ago.

You can still ask me questions on this contact even after you have accepted. I think you have a week possibly more.

 

You can also open a new question and request me. Should you decide to accept my answers, please click on the ACCEPT button by this answer.

 

Thank You!

Jake "THE AUDI DOCTOR"

Jake, Technician
Category: Audi
Satisfied Customers: 2398
Experience: Over 30 years experience, 17 years with Audi, Factory trained
Jake and 6 other Audi Specialists are ready to help you

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 P Elm City, NC
< Last | Next >
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, 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. Jim Castleberry, 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
 
 
 

Meet The Experts:

 
 
 
  • AudiDoc

    Independent Audi Shop Owner

    Satisfied Customers:

    1681
    I've been working on Audis since I was 18 and own an independent Audi repair and performance shop
< Last | Next >
  • http://ww2.justanswer.com/uploads/audidoc/2008-12-23_175252_headshot.jpg AudiDoc's Avatar

    AudiDoc

    Independent Audi Shop Owner

    Satisfied Customers:

    1681
    I've been working on Audis since I was 18 and own an independent Audi repair and performance shop
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    461
    Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
  • http://ww2.justanswer.com/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG Mike Kelly's Avatar

    Mike Kelly

    Audi Mechanic

    Satisfied Customers:

    259
    17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
  • http://ww2.justanswer.com/uploads/FourRingsTech/2010-01-26_135603_GetAttachment.jpg Michael Miller's Avatar

    Michael Miller

    ASE Certified Technician

    Satisfied Customers:

    241
    ASE Master Technician. Audi certified, including R8 and TDI (clean diesel).
  • http://ww2.justanswer.com/uploads/NA/nabilc/2011-1-24_205715_jap500.64x64.jpg Billy's Avatar

    Billy

    Trainer/Master tech.

    Satisfied Customers:

    229
    Trainer 8+ years, Master tech. 10+ years, SAE member
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    204
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    174
    ASE Master Automobile Technician with over 20 years exp. in this field.