Have the same problems with my 2010 Roadster Sport 3.0 - as per Morgan dealer my sport exhaust is "too progressive", leading to gases flowing too fast between front and back lambda sonds (left OR right side - bank 1 or 2 of the engine) This creates an error, which does not indicate any real problem, but still it´s irritating as you can´t differentiate from a real engine problem. As Heinz stated, I also bought an OBD2 reader (around 60 Euro), with which you can also reset the onboard unit. The common errors with my Roadster are 153 and 154 - which are neglectable and can be reset. Feel free to contact me if you need any more details...
