The spanner light comes on randomly on my Astravan 04 1.7cdti. Has anyone any idea why this is happening? The van runs perfectly but i blew up an X plate Astravan (company van) a few years back and am now a bit worried. As mentioned, it runs ok. If i turn it off and then on again, it will sometimes go out and stay out but sometimes it needs to cool down a bit before it will stay off. Any help much appreciated. Forgot to mention that it was serviced about 2 weeks ago because this was happening but it is still happening?