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Start by testing fuel pressure. If not at specs, change filter and fuel pump. Pressure should be high, probably in the 40-50 psi range, any shop could tell you specified pressure. Also check for trouble codes, use a scanner.
Undo the plastic casing around the ignition.
Its only around 4 screws easy.
look around the barrel where you insert the key, there should be a black plastic ring around 3 inches down the barrel this is the key reader its not fixed so twist gently and slide up the barrel as close to the key as the wires attached will allow.
then try starting, if it works then the transmitter in the key is most likely deteriorated . if it works its only a quick fix and could deteriorate in time.
a new key and coded from Renault is £300 with no guarantee that its not a different fault so look at buying one of ebay and get that paired to the immobiliser.
there is another way of bypassing the immobiliser by removing a ball bearing in the fuel pump a bit more complex.
If your ABS light is on as well, have a shop scan it (it requires a special scanner). If it's just your Trac light without ABS, it is most likely a sensor under the hood at fault. If you are getting a check engine light as well, get the codes read!
This happened to me without an ABS light and it was the upstream O2 sensor. The reason it throws the Trac light is because if any components that the traction control uses (ignition, fuel) are affected by a bad sensor, the PCM shuts down traction.
In fact, when I replaced the O2 sensor, a handful of other little issues resolved as well.
If you do have an ABS light on, it could very well be a wheel speed sensor.
sounds like a possible pluged fuel filter or a tired fuel pump. the pump is cooled by the gas. so if you work it at 1/4 tank or below it tends to get hot. but towing may make it hot anyway. check fuel pressure and the replace the fuel filter
whats else do you expect ,snap on code reader your having a laugh .YOU HONESTLY EXPECT TO READ A RENAULT ???????????????WITH ENCRYPTED SOFTWARE .sounds like an ECU problem but it could be something simple on the fuel injection system but without hearing the noise to know if its air in pump or an electrical buzz .check fuel IN line for ingression of air first ,also check for return in case its blocked causing the pressure to build up to high .call a scrapyard then report vehicle stolen and make a claim .this is a renault remember its designed to be dealer only repairs not weekend mechanics