Hi All,

I've developed a problem on my 987 porsche BoxsterSmiley. The ABS/PSM warning lights comes on occasionally. Both will come on together at which point the PSM button no longer responds.

Turning off the car will clear the warnings until the next 'random time'Smiley. From my reading and looking at other posts in this forum, the possible problems it could be ( in order of cost) the

- Tires are worn causing uneven spin rate.

- Wheel speed sensor

- ABS Pump

- PSM Computer

or

- Contacts/connections to all above.

I haven't had a problem until recently (owned the car for 12 months). I had not much left on the rear tyres (Yokohama Advan Sport). Today I have replaced them with PS2s. But still no joy immediately the lights came on.

I have booked brake pads for next week, as they are lowish, at the Porsche Centre and will get them to look at the ABS/PSM issue if still present.

But I would appreciate if any one knows if I need to calibrate or reset the errors due to my new tyres or can shed any light in general. Might save me some time and money.