Punto Engine Warning Light - Stuart Lynch
I have a new Punto Sporting in which the engine injection warning light intermittently illuminates, usually when doing about 70mph. The car has been back to the dealer several times for diagnostics. So far they have changed the sensor and the wiring loom, but still no joy. The diagnostics show nothing out of the ordinary, and there is no rough rumnning when the light is on.
Any suggestions.
RE: Punto Engine Warning Light - honestjohn
Dear Stuart,

Could be a minor misfire being picked up by the oxygen sensor. Try changing your petrol to Shell which has a slightly higher Research Octane Number than average and which also contains a good detergent package.

HJ
 

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