Failing catalytic converter (details and repair information here)Catalytic converters can fail in a way that blocks the flow of exhaust gasses - either by melting or disintegrating. When they disintegrate parts of the honeycomb can become detached and block the outlet from the converter casing. In this situation the error happens quite quickly, the car starts shaking and power is lost - but when the car is stopped the errant bit of honeycomb of falls away from the outlet and all is good when re-started. Where the honeycomb melts the exhaust flow is reduced and so is engine power - but the evidence it leaves is quite noticeable. This is one of the few errors that shows adaptations completely different between the two Banks - one will be positive, the other negative. The reason for this is that we only have one MAF - and two banks. If the flow of gasses is inhibited on one bank then that bank becomes richer, and the other leaner. It is also possible to get knock sensor error codes when things get badly blocked.
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