Hello professional world, after changing the cylinder head gasket, my Volvo (B5252) jumped immediately… in order to run more and more restless during the test drive and to stop after about 3 km. No start possible/not started any more. After a long search crankshaft sensor replaced with new part. Volvo jumped immediately, then s.o. remained in the same place. ADAC, towing! Apparently a lot of unburnt petrol got into the exhaust. Anyway now still burns The Lambda probe display. I run out of ideas. Does anyone else have suggestions?? C.M. Oh yes, camshaft sensor was replaced by new part after damage to the head.