Chrysler grand voyager 2010. Been absolutely fine but on 2 occasions 4 months apart I get in the cat turn the key and nothing happens. I get out , lock and unlock and car may then start but cuts out straight away. Eventually after about 5 mins of trying car starts fine, but yellow engine warning light is on but not flashing. Stays on for 2 days then goes off. Any ideas?

SOURCE: fiat scudo van engine light

sound like a wiring problem check the starter and ignition switch could have a short to ground or short to power

SOURCE: 2005 Jeep Grand Cherookee sometimes won't start

This could be something simple. Your starter draws far more power than anything except for the a/c clutch (not in play here) Since all accessories are functioning, it's likely that the battery terminals are oxidized. A high-draw item will actually break the connection temporarily. This condition will also change with humidity and temperature. Remove them and use a small wire brush or sandpaper to clean the battery posts and the inside of the connectors on the wires themselves. If you have done this and still have a problem, then you should start looking for other larger problems.
Good luck

SOURCE: Car wont start

could possibly be a flat battery possible could be the starter motor also when you unlock the car with the key the immobilizer should of disarm

SOURCE: turn the key and nothing happens,no crank,no sound,no start

It seems that you have a loose wire, bad connector or perhaps the main computer itself that is causing a problem If the shop is not seeing any codes, or codes come and go, likely I'm right...but someone is going to have to actually do some intensive testing to find the real cause. You can likely get another computer from a local scrapyard far cheaper than what the dealer will charge you...as far as wiring, you need a good accurate schematic a good volt/ohmeter and lots of time to trace wiring. When checking connectors test the pin, then probe the wire going into the pin...often the problem is where a wire meets the backside of the pin, either corroding or breaking..This also applies to any modules such as the security system...what you see on the dash does not always tell you that connection to components is good. This is not a "fix, but rather, a direction to go in. (exactly what I"d need to do if I was there)
Right now, everything is suspect including fuel system, till you rule it out!!!

SOURCE: when i start my car it just cuts off again this happens a few times then works fine, also after a few miles of driving the abs warning light comes on my car is an N reg audi A4 automatic 1.8

Hi, I had the same problem. it is the imoboliser, it reads a code in your key while starting. you need to get the code in the key reprogramed. if that wont work you will need to get a new ignition barrel. Audi dealer will reprogram your key.