Ignition key - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 09-29-2008, 04:39 PM Thread Starter
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Ignition key

I am having a problem starting my 7yr old C220CDi with the ignition fob.It keeps failing to engage the starter motor and I have to keep turning on and off until it eventually starts. The ignition lights mostly come on but are sometimes not operating when I turn the fob. I have been told it is a £500 repair but has anyone a cheaper answer.
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post #2 of 4 (permalink) Old 09-30-2008, 10:28 AM
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Before going to change your Ignition Switch or even your starter, replace the Neutral Safety Switch first, most likely located underside of car, driver's side of transmission.
The Neutral Safety Switch also incorporates the Back up Light Switch on some MBZ.
Sometimes, if this is defective, you could still start the car on the Neutral position but eventuall it would not even start anymore in Neutral. I am just sharing you what I went thru. Let me know if I can help you with the part.
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post #3 of 4 (permalink) Old 09-30-2008, 03:06 PM
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Describe better the " keeps failing to engage the starter motor"
That might be weak battery or wear out ignition switch.
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post #4 of 4 (permalink) Old 09-30-2008, 10:04 PM
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Doesn't this car already have the IR key? If it still starts at least occasionally, it could be a bad starter solenoid/starter motor. I would measure the starter motor solenoid drive voltage when the key is turned. If the solenoid gets drive power, the EIS would be fine. If it only gets power occasionally and the starter motor also runs at the same time, then it sounds like an EIS isssue.
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