Car

Ask a mechanic online and get answers to your car questions

Ask an Expert,
Get an Answer ASAP!

2003 hyundai: check engine light the light came..auto zone..obd II…

Customer Question
my 2003 hyundai has check...
my 2003 hyundai has check engine light the light came on from time to time I took it to auto zone they diagnosed it with the obd II it said the probable cause was one of the following.
H02s11 circuit slow response.
1. probable cause
2. poor electrical connection
3. rich or lean air/fuel ratio
4. engine mechanical condition
5. faulty H02S
I went ahead and changed both H02S
the light came on about 3 days ago and has not gone off since, I went to auto zone again and the OBDII said the following condition exist.
catalyst efficiency below thresold- bank 1 probable cause
1. leak in exhaust before converter 2. faulty HO2S bank 1 3. rich air/fuel ratio 4. faulty catalytic converter. the vehicle runs just fine however I need to take to get tested my licensa plates plates expire 06/30/2010 please advice. thank you Isidro
Submitted: 8 years ago.Category: Car
Show More
Show Less
Ask Your Own Car Question
Answered in 14 minutes by:
6/21/2010
Auto Mechanic: danny, Mechanic replied 8 years ago
danny
danny, Mechanic
Category: Car
Satisfied Customers: 5,064
Experience: Mechanic at school corp bus garage! Experience in fleet diesel and regular automotive.
Verified

The following conditions may be contributing to your fault.

 

 

  • Faulty injector.
  • Air leaks in the intake manifold.
  • Faulty MAP sensor purge valve coolant temperature sensor.
  • Wiring connection problem
  •  

     

     

    The folowing pdf shows testing and related concerns.

     

    http://www.mediafire.com/?ydwugwonnzo

    Ask Your Own Car Question
    Auto Mechanic: danny, Mechanic replied 8 years ago
    Thanks
    Ask Your Own Car Question
    Customer reply replied 8 years ago

    you mention wiring connection problem, what wiring?

    also how can i check for intake manifold leaks?

    is the (map sensor purge valve coolant temperature sensor) 1 part or 2 separate parts sorry for the ignorance but you are the expert.

    how do i check the fuel injectors to see which one might be faulty?

     

    thanks

     

    Isidro

    Auto Mechanic: danny, Mechanic replied 8 years ago

    the wiring to the o2 sensor or connection to it. The intake will have a visable leak or a harder to detect internal. her is the testing for the map sensor. dont worry about the temp sensor part.

     

    http://www.mediafire.com/?ni4zjz22ajx

     

    here is testing for in

    jectors.

     

    http://www.mediafire.com/?kmztk1h2nmm just open pdf's

     

    Ask Your Own Car Question
    Customer reply replied 8 years ago

    Hi Daniel I have just finished testing the map sensor, the specs say that the voltage should be between 4-5 with key on the on position my car shows 3.91 and with the vehicle idling should be .5 2V I get 1.35

     

    shoul I change the Map sensor it meets the idling Voltage which I think is the most important what do you think?

     

     

    Thank

    Isidro

    Auto Mechanic: danny, Mechanic replied 8 years ago
    I dont think it bad and did you pin out the harness also.
    Ask Your Own Car Question
    Auto Mechanic: danny, Mechanic replied 8 years ago
    Thanks
    Ask Your Own Car Question
    Customer reply replied 8 years ago

    yes the only test I did not do was test #2 checking for open circuit or short to ground between the engine control module and the map sensor. tets 2 and 3 check out fine.

     

    please advice

     

    Isidro

    Auto Mechanic: danny, Mechanic replied 8 years ago
    Can you give me exact codes you had? just the #'s like p0175
    Ask Your Own Car Question
    Customer reply replied 8 years ago

    i just got back from the state testing station they got the following code # XXXXX

     

     

    THanks

     

    Isidro

    Customer reply replied 8 years ago

    Danny, what are the odds I might have gotten a bad 02 sensor from the aoto parts store.

     

    Isidro.V

    Auto Mechanic: danny, Mechanic replied 8 years ago

    10 percent it happens. lets test it here is a pdf.

     

     

    http://www.mediafire.com/?ydnd2l03dfq

    Ask Your Own Car Question
    Was this answer helpful?

    How JustAnswer works

    step-image
    Describe your issueThe assistant will guide you
    step-image
    Chat 1:1 with an auto mechanicLicensed Experts are available 24/7
    step-image
    100% satisfaction guaranteeGet all the answers you need
    Ask danny Your Own Question
    danny
    danny
    danny, Mechanic
    Category: Car
    Satisfied Customers: 5,064
    5,064 Satisfied Customers
    Experience: Mechanic at school corp bus garage! Experience in fleet diesel and regular automotive.

    danny 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

    Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV.

    DutchUSA

    < Previous | Next >

    Meet the Experts:

    Chris (aka-Moose)

    Chris (aka-Moose)

    Technician

    1,345 satisfied customers

    16 years of experience

    Ted G.

    Ted G.

    ASE Certified Technician

    1,754 satisfied customers

    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

    George H.

    George H.

    ASE Certified Technician

    1,564 satisfied customers

    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

    GM Tech (Cam)

    GM Tech (Cam)

    Auto Service Tech

    680 satisfied customers

    GM Grand Master Technician 2007. 14 years experience.

    Amedee

    Amedee

    Former ASE Master Tech

    2,562 satisfied customers

    ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

    Jerry

    Jerry

    Master Mechanic

    2,181 satisfied customers

    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager

    Richard

    Richard

    ASE Certified Technician

    1,009 satisfied customers

    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes

    < Previous | Next >

    Related Car Questions
    The engine is missing. I need to know what code PO168 and PO
    the engine is missing. I need to know what code PO168 and PO 140 are on a 2005 Jeep Liberty 3.7 The other code I got was PO 155 which is an oxygen sensor. … read more
    David Craig
    David Craig
    OWNER/MECHANIC
    Associates
    5,880 satisfied customers
    Car is a 1997 AUDI A6 Quattro station wagon. (AUDI dealers
    Car is a 1997 AUDI A6 Quattro station wagon. (AUDI dealers are and very unreliable and outrageously expensive). Problems: 1. The check engine light has been coming off and on for mmonths. Local mechan… read more
    Auto Psychic
    Auto Psychic
    owner
    Bachelor's Degree
    1,364 satisfied customers
    I have an 2004 elantra hatchback. Check engine light came
    I have an 2004 elantra hatchback. Check engine light came on, had it scanned at autozone & got code P2626 w/ definition "linear heated oxygen sensor- bank 1 sensor 1 (H02S11) pumping current open. Pro… read more
    BOBBYSS
    BOBBYSS
    TECHNICIAN/ADVISOR
    Associate Degree
    8,343 satisfied customers
    Hello, I have a 1996 Isuzu Rodeo 3.2L.4wd/auto with 81,000
    Hello, I have a 1996 Isuzu Rodeo 3.2L.4wd/auto with 81,000 miles..been sitting several years/changed fuel pump,filter,plugs, oil and filters... ck engine light is on and codes indicate Fuel Air Meteri… read more
    JamesH
    JamesH
    Associate Degree
    432 satisfied customers
    Code reader..Up catalyst Below Threshold (bank1) where exactly is this
    In using a PocketScan Code reader it says P0421 "Warm Up catalyst Below Threshold (bank1) where exactly is this located on a LW300..? Thanks Steven… read more
    AutoDr
    AutoDr
    fleet Manager
    Vocational, Technical or Trade Scho
    80 satisfied customers
    I REPLACED THE OXYGEN sesor, AND THE catylitic CONVERTER
    I REPLACED THE OXYGEN SESOR, AND THE CATYLITIC CONVERTER, AND I'AM STILL GETTING A CODE THAT THE CONVERTER IS BAD… read more
    Eric
    Eric
    Retired
    N/A
    14,436 satisfied customers
    DTC Reported P0137, P0157, P1171,... Mechanic told me to pour
    DTC Reported P0137, P0157, P1171,... Mechanic told me to pour 4 bottles of HEET in a full tank. Is this the solution? Need to pass inspection.… read more
    Amedee
    Amedee
    Former ASE Master Tech
    Vocational, Technical or Trade Scho
    2,562 satisfied customers
    I have a 1998 bonneville with the check engine light on. The
    I have a 1998 bonneville with the check engine light on. The error code is saying system to lean bank 1. We replaced the 02 sensor. Any ideas?… read more
    OnlineHelp
    OnlineHelp
    Bachelor's Degree
    3,390 satisfied customers
    2004 cadillac escalade ext: an obd II P0420 code, catalyst efficiency
    what does an obd II P0420 code, catalyst efficiency below threshold (bank 1) on a 2004 cadillac escalade ext really mean and what repairs do u recommend ?… read more
    Steve Porter
    Steve Porter
    exhaust..car and the car feels like its stalling..tune..running rich
    i have a deaweo nubria 2000 and it has 66000 miles. i have noted in the past few weeks that the more exhaust is coming out of the back of the car and the car feels like its stalling. I haven''t gotten… read more
    westrope65
    westrope65
    Associate Degree
    156 satisfied customers
    I have a 2002 Oldsmobile Alero with a P0420 Catalyst System ...
    I have a 2002 Oldsmobile Alero with a P0420 Catalyst System Efficiency below threshold Bank 1. How do I fix this… read more
    JHoop
    JHoop
    Owner,Technician
    High School or GED
    My check engine light has been on for 3 weeks..auto Zone..pcm
    My check engine light has been on for 3 weeks I took it to auto Zone to put it on the machine and it read "The PCM has determined that the catalyst system efficiency for bank 2 is below threshold for … read more
    Hammer Time
    Hammer Time
    Mastertech
    Vocational, Technical or Trade Scho
    2,650 satisfied customers
    1996 chevy: engine temp..rpm gauge needle would jump
    I have a 1996 chevy s-10 that will not start. I had trouble with this truck 3 months ago in which Tim B helped me with on this website. For the past 8 weeks the truck would start normal but when the e… read more
    david
    david
    Heavy Duty Repair Mechanic
    Vocational, Technical or Trade Scho
    495 satisfied customers
    I have a 96 chev. corsica six cyl.that has a check engine light on.
    I have a 96 chev. corsica six cyl.that has a check engine light on. Had it scaned for codes and low voltage to 02 sensor bank one and two showed up. The engine is also running very rich in fule mixtur… read more
    Red
    Red
    Auto Mechanic
    Vocational, Technical or Trade Scho
    132 satisfied customers
    Kia sportage: my check engine light came on , So i got OBII reader..po
    my check engine light came on , So i got OBII reader and retrived the codes po422 and po 440. and i can't find a book on the Kia sportage they are not avaliable.… read more
    Marc
    Marc
    fleet supervisor
    Vocational, Technical or Trade Scho
    1,140 satisfied customers
    1997 chrysler: I have identified the code P0171..anyone tell
    I have a 1997 chrysler LHS. The engine light is on and I have identified the code P0171. Can anyone tell me what this means? Optional Information: 1997 Chrysler LHS 3.5 liter Already Tried: just came … read more
    Michael
    Michael
    Work Equip. Repair Foreman
    Vocational, Technical or Trade Scho
    554 satisfied customers
    97 Ford Explorer: engine light came..-egr..disconnected..fuel system
    I have a 97 Ford Explorer in 2004 the check engine light came on - I went to Auto Zone and found the code - I replaces the following: sensor-egr; valve-vac and the 02 sensor. Now the check engine ligh… read more
    GearHead1
    GearHead1
    Prototype technician
    Vocational, Technical or Trade Scho
    34 satisfied customers
    My check engine light came on and I got it checked...obdii
    My check engine light came on and I got it checked. The description on the OBDII said there is a warm up catalyst efficiency below the threshold (bank 1). What do I need to fix?… read more
    bestservices
    bestservices
    110 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