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How is the vehicle running?
Any smoking,abnormal noises,etc?
Are there any warning lights coming on at all?
There was smoke emitting when the test was carried out. The vehicle has been running okay. No warning lights.
Can you tell me if the reason for failure was due to the engine pushing out smoke or if it was due to actual emission content. ie high CO or HC or Lambda for petrol engine or smoke density for a diesel engine.