2001 Hyundai 1.6 se coupe won,t start!!?

2005 coupe SE. Had same problem for about 3 years. She runs perfectly but every now and then won't start. Had crank shaft sensor changed.. No good... Reprogrammed keys ... No good. Just bought new key from hyundai at £110 ... No different.
They say never heard of this problem but see lots of posts on different website.
Seems fir some reason car doesn't recognise MY key so shuts down as thinks I am a thief. Leave from 30 mins to overnight and OK. BIG HASSLE when I have an appointment. Hyundai can do electrical diagnostics at loads of money but NO guarantee will find fault.
Does anyone have the answer as I love the car and NO other problems in TEN years.

Ladymcbeth of Staines
August 2014

i have the SAME FRIKEN problem piss me off. works perfect then this.. im getting alot of advice from evrywhere i look tht its the crank sensor. lets u and i try it kyu

aussi
May 2010

body controll module

2.7 v.6 Supercharged Coupe
August 2009

cranks shaft sensor may be at fault

big al
September 2008

i bet my house on it that its the crank sensor you can find it at the front of the block to the right of the exhaust, (hyundai technician)

dave
October 2007

I have a 2005 accent, which had its smarta (sp?) unit replaced. This is the part which reads the chip on the key. What happened was the car would start then immediatly cut out again, so it doesn't sound like an immobiliser problem. Unfort i don't know the answer to what it could be. The extent of my knowledge is that maybe the ignition coil has gone... this would mean the car would turn over but no spark would be produced at the spark plug, so the car wouldn't fire up. The only other thing it could be that i know of is something blocking your air supply. There is a whole host of other things that could cause it from ecu failure to a dodgy fuel guage, and therefor no petrol (don't laugh happened to a mate) sorry i can't be more helpful

Morv
April 2007