Just make sure to disconnect the battery and the red plug for the SRS under the passenger side carpeting (w124). Also, don't use the steering lock to hold the steering wheel, have someone else hold it or use a piece of scrap wood wrapped with a towel as a counter brace.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE