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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53904
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I have a w220 2000 model with a fault code p1520 engine

Customer Question

I have a w220 2000 model with a fault code p1520 engine would start then dies
Submitted: 2 years ago.
Category: Mercedes
Expert:  Marty replied 2 years ago.
Hi, a P1520 code is not a valid Mercedes fault code. A generic scan tool must have been used to read the fault codes. If the motor starts and dies the problem could be a bad key or a bad ignition switch. Step 1 is to try another key. If you still have trouble you may need to replace the ignition switch but before you do that I would get the car connected to a factory level scan tool to get an accurate reading of the fault codes. Some other possibilities that come to mind are a bad mass air flow sensor or an air intake leak or loss of fuel system pressure.
Let me know if you have any questions.