I'm having problems with my cr 140 fr leon. It's give 3 fault codes, the first is EGR temperature sensor G98 - signal to low, no signal communication. The second fault is EGR Sensor 1- implausible signal. And the third is EGR valve (n18) malfunction - open circuit. I have changed the EGR valve but the car is still put the engine management light on. Any help is massively appreciated!