My merceds clk 320 1999 wont pick up speed

Battery Disconnect or Replacement Problems

it sounds like it needs a tune up

You need a new Vehicle Speed Sensor.

When I try to start my merc clk 2003 the horn blasts but has been fine all day. Any suggestions?

YEP BAD SPARK PLUGS,CLOGGED AIR FILTER,TRANSMISSION SLIPPING DUE TO TORQUE CONVERTER FAULTY NOT LOCKING UP FOR OVER DRIVE.LOW TIRE PRESSURE,HIGH SPEED DRIVING.LOT OF CITY DRIVING LIKE SHORT STOPS, LOW ENGINE COMPRESSION.WEAK SPARK IGNITION DUE TO BAD COILS.

as far as a "brand"is concerned, any, bar the cr.p you buy at the supermarkets(these have NO additives)mercs will run on 89 octane,but as they are computer controlled if you use any higher grade your gas mileage will be far better.(try it)use an injector cleaner EVERY 25k.

napa or the dealer. its trim.

egr or your mafs

Hi there
I had something similar on my merc
but yours sounds similar.
the fact that you say the steering lock no longer works is very worrying, most times the key not going past position 1 is due to the steering lock being actuated and the pressure in it has to be released before the key will turn, you will have to go from lock to lock the find where the steering lock actuates when this happens follow my wiggle method of turning the steering wheel slightly when the steering lock is on the disengage it. ie keep trying the key whilst wiggeling the steering wheel.
hope that helps

HELLO. IT SOUND'S LIKE YOU COULD HAVE A BAD RADIATOR FAN SENCER.!!! THAT NEED'S TO BE CHANGED.!!! IT WHAT CONTROL'S THE RADIATOR FAN.!!!THAT TURN'S IT ON & OFF.!!!"GOOD LUCK"