Can anyone give me a hint at undoing the safety catch or lock on the electrical connector for the oil level sensor on the M113 (and M112) so I can unplug it? It's located in an area that's almost impossible to reach and to see; so I can't tell how it's secured. I need to remedy an oil leak, and have to remove the sensor to replace the o-ring and/or the sensor itself. I don't want to break the connector in trying to remove it.

TIA! DUTCH

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1973 280SE 4.5 (Sold)
1984 LWB 280GE (Sold)
2000 G500 NMLE - "Deep Throat"
2007 ML320 CDI (Sold)
2010 Porsche Cayenne S Transsyberia TipTronic (Sold)
2010 Audi Q7 3.0 TDI (Sold and Sorely Missed)
2014 ML350 BTC
2015 Audi Q7 3.0 TDI (On Order)