Hi, 2001 1.8 LS vectra, showing codes, P1555, P0170, P1525 and finally P1550. All seem to relate to throttle and mixture. If I change the electronic throttle thngy will that fix it or am I missing something.

Bry Wilson, January 2010

Hi Bry, first check the connector on the throttle unit make sure the pins are clean, then check all the vaccum sense pipes for splits or fallen off, if all is well replace the throttle unit, have a look at www.autotecelectronics.com they do service exchange and much cheaper than the dealers

nigel, January 2010