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Hey,
Just had my car in service for 1.5 weeks with a Vanos problem - left side block #2 was out. SES light did go on, no doubt there. Engine ran rough, lower idle, and felt like it wanted to "die" while sitting at a stop light. My service guy said had it not been under warranty, it would have cost $4k. He also said if I had driven on it for any length of time, I would have blown the engine, as the timing was off and would have led to more problems. You may want to call him, Jesse at SC BMW, 408-249-9070. Just tell him you know he just worked on an M5 with a bad VANOS and wanted to find out what the signs of it might be....Good luck!
Quad
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