Hi.
I know it's been along time since you posted this message, but I will give you an ansver anyway.
I had the same problem; While driving I discovered that when the engine was "like" breaking the car, the enginelamp started to light up (turnd off after stoping and restarting the engine). I checked the failure codes and the only code comming up was 1. ABS - failure and 2. Speedometer falure. The problem came after I removed the ABS - ring (it was totaly rusten) at the right crank-knot (my car has the stearingweel at the left side). I just took of the crank-knot and mounted a new ABS - ring. I got back my speedometer, the ABS-lamp turned off and I have newer after seen the Engine-lamp on during driving since. It is a easy fix, but the problem could allso be a ABS-sensor malfunction.
Hope this will be helping many Opel/Vauxhall owners.
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