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That hose should pull off.They can be tight.Try small needle nose pliers and twist the hose as you pull it off.If Ambler is not to far for you.We are an SDD JLR repair shop.
Do you have power on pin 16 of the data link connector.If not check for blown fuse.If the scan tool powers up but you cannot read codes you have a problem on the network maybe a module pulling it down.
These cars have service bulletin on injector problems.You can try a pressure cleaning service.To diagnose we use the consult scan tool and disable each injector while looking at 5 gas readings.
Was the car in an accident before.Possibly a prior repair not done right.Are you talking about the air bag in the head rest.Sounds like a software issue.Call us if you would like it checked out.Ambler Tire 215-646-9150.We use the xentry diagnostics for Mercedes.
Evap system leak.Check your gas cap is tight.Get a shop with the IDS system to run a live evap test and check software(Like Ambler Tire).Advance auto or auto zone dose not have the capability to do this.We charge $90.00 to do this.It may also need a smoke and pressure drop test.This can run an additional $60.00. We are not far from you.Call us if you want it fix right 215-646-9150.
That panel over the center brake light should pop up giving access to the bulb.Book time is .4 to change.It should cost you under $40.00 to have it done.There are some good local shops in Lansdale instead of the Dealer.
Codes should be checked with a GDS or Carmin lite tool.It may show more information.Check the air hose after the mass air sensor for cracks air leaks.
A bad key will give a no start not a cut off.These cars are known for bad crank sensors.If its just a no start and a second key works its most likely a EIS module.You will need a xentry scan tool and a work shop key from Benz.
Most likely a bad wheel speed sensor.
Pretty sure this car uses an additional battery for accessories.That may be going dead.I would take it to a shop that is equipped to work on Mercedes.They should have a Xentry diagnostic tool.(We have 2 here)Some settings may need relearning.