Posted by Kevin Williams on January 11, 2008, 7:44 pm
"O" Wise Ones,Vectra in last friday codes p1555 and p0171 Checked archives and carried out a good clean to throtte boby and replaced MAF with OE replacment today all OK codes not reappeared and drives well On rechecking for codes with MT2500 I have a code posted po172 system rich serial data shows front and rear o2 sensors at 900 mv and system rich Used Pico on o2 sensors and after an inital start both climb fron 500mv up to 900mv with no switching cars runs well Carried an emission test at 2500rpm co 4.37 lam .891 hc178 o2 0.07 co2 12.60 Serial data at 2630 rpm acc pedal 1 1.49v acc pedal 2 0.73 throttle valve 1 0.67 throttle valve 2 4.38 coolant 86 deg coolant voltage 1.75 air flow 30kg o2 before cat 904mv os after cat 915mv mixture rich inj pluse 2.5ms ing advance 40 Cars drives OK with no misfire or lack of power No other work carried out resently Hope you can help regards Kevin