Bigdave1230 Posted January 28, 2020 Share Posted January 28, 2020 Had a fault on my 2008 Q7 where the car cranks over for 2-3 seconds then stops cranking. Starter turns over fast when it does crank. Leave the car for 20 mins and it will crank and fire up no problem. Seems to happen when the car was warm but I can’t say it never did it when cold as I can’t remember if it did. Vcds shows no fault and when it’s running it doesn’t miss a beat. Very intermittent and very very very 🤬ing annoying............................... Replacing the crank shaft sensor seems to have cured it. Hope this helps anybody with a similar problem. 👍🏻 1 Quote Link to comment Share on other sites More sharing options...
Trevor Posted January 29, 2020 Share Posted January 29, 2020 Thanks for the update information Dave....I have altered the topic title to show the issue has been resolved Quote Link to comment Share on other sites More sharing options...
AndrewC91 Posted January 31, 2021 Share Posted January 31, 2021 Exact same happening mine, its 2008 aswell and seems to be when warm and when you leave it for 15-20minutes it fires up, was the camshaft sensor a big job to change? Only started happening the last 2 weeks and has happened 3 times in that space. Quote Link to comment Share on other sites More sharing options...
Bigdave1230 Posted February 3, 2021 Author Share Posted February 3, 2021 It’s not a hard job but it is fiddly. I’d recommend doing it on a ramp as you need to take the wheel off and the engine under tray to get access. It’s only held in with one allen key bolt. The sensor was about £60 I think. Mines a 3.0 v6 but I think the 4.2 v8 has 2 and might be in a different place so would be worth checking beforehand if yours is a V8. Quote Link to comment Share on other sites More sharing options...
Bigdave1230 Posted February 3, 2021 Author Share Posted February 3, 2021 Sorry just seen your wording! I changed the crankshaft sensor not the camshaft sensor Quote Link to comment Share on other sites More sharing options...
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