Over the last 6-8 months the electronic ignition switch on our 98 C230 has started acting up. Sometimes the tip start feature doesn't work, sometimes the car won't start, sometimes the key won't activate in the lock, and sometimes it won't turn all the way. The Indy read the codes and verified what the dealer was saying - bad EIS module. This translates to a new EIS unit, a 'special' one shot orange programing key, and a replacement metal key insert to go with the brand new black and chrome key (the old keys read out on the software as being unusable with the replacement lock current software version). And of course the usual "submit your VIN number, drivers license, etc" to verify that they can order the ignition switch and key tailored for my car!

So after the identity check, delay in parts shipment, and the sticker shock, the new EIS is in the car, the Orange key is now an expensive paper weight after doing the 3 minute programing job, the new $200 bling key works just like the old keys used to work, and the 2 old keys won't operate anything. So just out of curiosity, I tried the old valet key in the new ignition - and it works!

But why? If the old main keys won't work on the new ignition, (or the doors and trunk), then why would the old valet key work with the new ignition switch? The factory diagnostic computer says the old keys are not compatible, but why can't they be re-programmed? Yeah, yeah , the software says they aren't compatible, but tell that to the valet key!

Is there any way to salvage the old keys so I don't have to buy another tacky chrome key? Is there any problem with daily use of the valet key in place of a regular key? Does the valet key recode the antitheft each time like the regular keys? If not, is that why it works in the lock - it just parrots the last read security code? (Is this a weak spot in the antitheft system - a valet key will start any of the cars?)

BTW, the dealer says that MB will be happy to take back the orange key for recycling/reprogramming/reuse - but without any refund or credit. Not a chance. If it can be re-used, it should have been a returnable security deposit loaner item, or else a built in activation feature in the new chrome key - anything but a 3 minute one shot item that costs almost as much as a regular key!

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E