I tried to post before but i messed up. Here i go again. I have a 1997 e420 and its in limp mode. When i start it up it makes a zinging noise and slowly goes quite. If i rev the engine it goes zinggg ( hard to explain). When i drove it home in limp mode iit made a constant zinging noise. I pulled the codes with my reader and it gave me a P0730 incorrect gear ratio. I tried to look it up but it says its a generic code. The car has 110,000 miles on it and the black cap is still on the dipstick tube so i know it hasnt been serviced . Any help would be greatly appreciated . Thank you all Alawens

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