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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.
You should get your money back,Car fixed at a huge discount or credit towards another car.If the car came with out a warranty you may be stuck.Try 1-800-lemonlaw we do work for them,they have helped a lot of customers get compensation.Did any one find if there are any other problems like the cooling fan not coming on or a stuck thermostat.
Distributors are very commen for no spark conditions on these cars.