As above as my light is now on and i dont get wat reads the pressures

Thanks chaps

i think it works through the abs sensor and detects it needs more resistance to turn one wheel that is either low pressure or flat and then this relays it to the TPM and then puts the light on the dash

It works by reading the abs ring teeth. So if a tyre goes down the rotation speed will be greater on that ring compared to others. It could also be the ring has cracked and opened up, giving the fault light.

It's done by comparing wheel speeds. A flat tyre has a smaller rolling circumference than an inflated one and will therefore turn faster than the other wheels. The ABS sensor is used to detect the wheel speed.

I get the feeling that the abs system may be involved

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What metblackrat said

Thanks guys,problem has only arisen since i put the 18s on but i did give the arches a good clean out with the hosepipe so maybe have some water where i shouldnt :(

Have you pressed the reset light

Should have reset it to adapt it to the new tyres / wheels.

I have lads yes,only pressed it twice though??

Press and hold until it goes bong.

Thanks fella will try it

Press and hold until it goes bong.

Yes must go bong to reset.

Pressed the reset button and waiting for a "bong" and jobs a goodun.Thanks for the help chaps,find this forum very usefull for information and well worth the price