I have an 03 Audi A4 3.0 Quattro that wont start
I have an 03 Audi A4 3.0 Quattro and recently after the car has been driven for more
than 20 minutes and shut off it wont start but if I wait awhile like say an hour or more it
starts up like nothings wrong. The engine check light is on and I got that checked out
and its an O2 sensor but I don't know if that has anything to do with it, but when its
running it runs fine no problem no odd noises of anything and the battery delivers power
to everything in the car just wont start or even attempt to turn the car over. Also the
battery is brand new
What did the code say? If it was a lean code then the car needs a fuel pump and filter. The only time the o2 sensor needs changed is when it says heater circuit malfunction.
well the natural suspect would be either the fuel pump or a dirty fuel filter. but i would not rule out a fault maf sensor either start from the top and work your way down as i say. start with the spark plugs, work your way back to the coil pack. keep an eye out for cracked or worn wires but also broken plastic hoses. my old 98 a4 has a bad habbit of breaking these rubbery type plastic hoses all the time. If you have never replaced the fuel filter before do so now, and take out the mass air flow sensor and clean it with maf cleaner theroly. when i first bought my 98 it did the same thing till i cleaned the maf and changed the fuel filter
It could be the run relay, I had a VW do the same thing, dealer hunted for this problem for three years. Just a suggestion.
By any chance would you happen to know which one is the fuel pump relay ?
its either under the hood or under the dash and might be hard to remove due to its location. but its usually a square shaped short one. i think there is 2 of them in total under the dash.
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