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Does my 2005 petrol Renault Scenic have an ignition coil fault?

I have a 55-plate 1.6-litre petrol Renault Scenic with a misfire. The dash display repeatedly says 'Check emissions' and 'Check injectors'. I had the vehicle plugged in and they told me it was a coil. So I had one changed, but the fault still appears. So I took it back and they changed number three injector, but still no good. The fault code is saying 'p0203 open circuit to number 3', but the wiring is testing ok. Shall I have the other three coils changed and could it possibly be the lambda sensor?

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My experience of Renault 1.6 petrol engines is that the problem is often the flywheel sensor, or its connectors or its cable.
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Far better than the previous model. The Grand model seats seven. Practical and versatile. Excellent crash test rating.
 

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