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#1
04-07-2014, 02:27 PM
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W140 security module / no start
Im planning to have a look a very clean 1998 S420 (140k) this week, however he says it wont start and when he had it scanned and the security module code popped up. $1500 dealer repair. Does not crank.
What steps do I need to take to fire this thing up in his driveway? Im hoping it might be something simple like the neutral saftey switch or something. Last edited by 244brick; 04-07-2014 at 04:03 PM. 
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#2
04-07-2014, 05:52 PM
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I beleive this car has a metal key blade, its a bit easier than the later items but equally pricey.
__________________
2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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#3
04-07-2014, 06:04 PM
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I would run the other way. lol. (But this coming from someone that has had problems with a W140 that I cannot figure out, lol).
Good luck!
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#4
04-13-2014, 04:47 PM
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1998 was the first year of the DAS system and 3 button keys for 140s. If the drive auth system ecu has died, there may be no way to start it. Sometimes d&c of the battery can get the car to start again. Just replaced one of these on a 99 SLK and there was no work around on that car.
__________________
Dr.Diesel - Shop Foreman Master Guild Mercedes-Benz Technician. Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand? 
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#5
04-20-2014, 12:58 PM
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Mine had a trouble no cranking,and I would have to hold the key at starting position for 2 monutes before it fired sometimes.It was my k38 relay that was bad.Its under the cover and behind fuses.@nd row of regular fuses.Space F I believe
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
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