Reverse lights not illuminating when the reverse gear is engaged is likely to be the result of failure of the reverse light switch. However, Cambiare suggests that the bulbs should be checked prior to replacing the switch as it has normally been experienced that vibration and voltage fluctuations cause the filament to fail.
Poor starting might be the result of a failing crankshaft sensor. Cambiare advises that technicians looking to diagnose poor starting, cutting out or poor performance should bear this part in mind during diagnosis and further mentions that monitoring the output from the sensor with a diagnostic scanner is the best way to identify this fault.