Start error mercedes sprinter 2001
New owner . Cleaned van yesterday, with cloth and bucket no hose. Van started as usual. 2 hours later. Start error. Key turns all positions. All dashlight, lights accessories etc working. Visual check of fuses. Ok. Charged 25 mins off another vehicle. Jump start. Still start error. Have tried all tricks on all forums with key fob sequence, battery disconnect.etc. no access to volt meter. 100km from dealer or mechanic. Any suggestions to override or repair to get running to get to dealer with star diagnostics?? Thanks in advance