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Yes Liam it may very well do on a petrol as the spark plug is used all the time to make a spark.
On a Diesel the glow plug is only used to start the engine, If you had a faulty glow plug you would get the EML light on when starting the car it would go out once the glow plugs had stopped being needed (or within a few minutes of the glow plug system turning off).
When you have the diag done if you check this thread out it may help you, but let us know any fault codes.
On a Diesel the glow plug is only used to start the engine, If you had a faulty glow plug you would get the EML light on when starting the car it would go out once the glow plugs had stopped being needed (or within a few minutes of the glow plug system turning off).
When you have the diag done if you check this thread out it may help you, but let us know any fault codes.
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