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Mercedes-Benz preventive maintenance repair questions and answers

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  • cerenato
    cerenato - 1998 Mercedes Benz E320 - Preventive Maintenance - 5/27/2012
    I had a code po300 scan from my Merc .,and the car shakes even not in gear and check engine flashes
    The car shake and no power
    • Jimm
      5/27/2012 Jimm
      P0300 = Random Multiple Cylinder Misfire

      A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

      A code P0300 may mean that one or more of the following has happened:
      •Faulty spark plugs or wires
      •Faulty coil (pack)
      •Faulty oxygen sensor(s)
      •Faulty fuel injector(s)
      •Burned exhaust valve
      •Faulty catalytic converter(s)
      •Stuck/blocked EGR valve / passages
      •Faulty camshaft position sensor
      •Defective computer

      Possible Solutions

      If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

      If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

      Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
  • cerenato
    cerenato - 1998 Mercedes Benz E320 - Preventive Maintenance - 5/25/2012
    What's wrong with the car when you turn the motor and put on gears it will run but it shake and the check engine lflash
    Changes tranny
    • tk8789
      5/25/2012 tk8789
      motor mounts might need to be replaced
  • beni
    beni - 1988 Mercedes Benz 190D - Preventive Maintenance - 5/7/2012
    0 answer
  • mench
    mench - 2003 Mercedes Benz S500 - Preventive Maintenance - 5/6/2012
    Any special tools required to change spark plugs? were is fuel filter located,
    • Jimm
      5/6/2012 Jimm
      No special tools - maybe a spark plug sockt - same as deep well socket only includes a foam inert to protect the spark plug ceramic. Only need a plug gap tool or feeler guage to set the spark plug gap before installing.
      The fuel filter is usually located by the fuel tank near the fuel pump. You can access the filter via an access panel underneath the rear seat.
      Try the many on-line auto parts sources, such as; or for the replacement parts.
  • CA_Kirk
    CA_Kirk - 1981 Mercedes Benz 380SL - Preventive Maintenance - 5/5/2012
    How to sell Mercedes that is not classic, yet but already not really transportation?
    How to sell Mercedes that doesn't fall into either category: transportation or classic car? Today's market is great for real "oldies" but 81 is too young! ...And it is convertible which means more maintenance. There are sites like M.B.C.A. (Merc. Benz Club of ...
    • Jimm
      5/5/2012 Jimm
      It all depends on the condition to determine the value and relative selling-ability. A cleaner vehicle - in good or better condition - regardless of the type - will always command interest and buyers.
      5/7/2012 CA_Kirk
      Thanks Jimm. It is in a good condition but what happenned when I posted craigslist ad I received tons of spam only. THat is versus receiving very little spam but tons of replies when posting an ad about '8o (1 year even older!) motorbike (Honda). What I heard so far is that that car - the year, the price (it is not a transport, like I say but a lux item, expensive in ways yet peculiar) could be sold ONLY (that's opinion of professional at Auto Museum not far from me) through special help. (-$$$)
  • anna
    anna - 2006 Mercedes Benz CLS500 - Preventive Maintenance - 4/30/2012
    Hi. I am thinking to buy this car it has 75K miles . Am I getting good car or what is your opinion?
    0 answer
  • jorge
    jorge - 2004 Mercedes Benz C230 - Preventive Maintenance - 4/30/2012
    Wat does p0095 mean How do i fix it i took My car to the show 3 times and nobody can fix my problem
    It's something to do wit recirculating air flap
    0 answer
  • chanan wolotzky
    chanan wolotzky - 1980 Mercedes Benz 450SL - Preventive Maintenance - 4/30/2012
    The yellow light from the instrument panel is on (next to the seatbelts sign ..)
    this sympton is on & off ,do not feel any changes in driving ,
    0 answer
  • hawaii
    hawaii - 1994 Mercedes Benz S320 - Preventive Maintenance - 4/28/2012
    Actually i have 300 se do you need to start car once a week if you do not use every day?
    0 answer
  • BK Clopton
    BK Clopton - 2004 Mercedes Benz S500 - Preventive Maintenance - 4/27/2012
    What is estimate for B service for my vehicle?
    • Jimm
      7/22/2011 Jimm
      Try the'Estimate Cost' feature this website for the service B estimate. To locate a shop in your area, try the 'Find A Shop' feature.
    • Thurston
      4/27/2012 Thurston
      We just Payed $480.00 for a service on our 2004 S500
  • yeroc37
    yeroc37 - 2003 Mercedes Benz C230 - Preventive Maintenance - 4/25/2012
    How would we know if all recalls have been done if we bought this car used?
    If it hasn't been done, can we get it done if it's over a few years old
    0 answer
  • Donna
    Donna - 1999 Mercedes Benz E430 - Preventive Maintenance - 4/25/2012
    Check engine lite is on. gas cap was loose, secured check engine light wont go off.
    i dont know the procedure to get lite to now go off
    • EG9 K20A3
      4/17/2012 EG9 K20A3
      Well it depends on the code, codes i know of which is gas cap replated are


      The last 2 codes have more than one solution aside from the gas cap, the first code is dedicated to the gas cap alone.
      EG9 K20A3
      4/18/2012 Donna
      i am printing this to put in my cars book. i did press the reset button on the left and the hm button on the right at the same time and held, then pressed the hm button three times and it reset the check engine lite. thank you! it was great of you to respond. Donna
    • EG9 K20A3
      4/25/2012 EG9 K20A3
      no wories and keep me posted :) good luck
  • Sniper
    Sniper - 2007 Mercedes Benz ML320 - Preventive Maintenance - 4/23/2012
    Software update
    Do we need to update software on ml320
    0 answer
  • Sniper
    Sniper - 2007 Mercedes Benz ML320 - Preventive Maintenance - 4/23/2012
    SRS light is on . How to reset it
    Srs light is on what does this mean
    0 answer
  • stevchr
    stevchr - 2005 Mercedes Benz E500 - Preventive Maintenance - 4/21/2012
    What do I need to perform a basic tune up on my 2005 Mercedes E500.
    It time for tune up
    • Jimm
      4/21/2012 Jimm
      It a minimum; new spark plugs, new fuel and air filters.Try the many on-line auto parts sources, such as; or for the replacement parts.