Introduction
Does your 1.9 TDI suddently sets out or fail to start and there are no events in the log ?
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The engine suddently cut off very shortly (less than a second) while driving, mostly while maintaining level speed
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You may be fast to observe the glow plug indicator lights up very briefly when the engine cuts off
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The car may refuse to start when warm, not overheated, and then willingly start when cold again
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You may hear a crackling sound when the temperature is below freezing and the glow-plugs has to be active for longer than usual
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It can happen once or many times during a days driving - OR it happens only once a month - No schedule or pattern.
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In my 1998 SEAT Toledo 1.9 TDI (90 HP) the relay with label 109 on the top was the culprit
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Access the relay where the fuses are located. in my car it was in the drivers side behind the small glove compartment.
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Talk about loose connections...See inside the red box of photo 1
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Secondly, the strip inside the relay barely touches the terminal. See photo 2
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These two loose connections account for the erratic behaviour of the engine
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The relay is worn out.....the copper-wire is yellowish to look at, compared to the more known copper-colored - replace the relay. Photo 3 does not clearly show it, but may get an idea
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Buy a new relay, as used ones may be similar worn. Replace the relay and reassemble the lid to the fusebox
