Hello

I'm looking for further information on fault code P3042/19498 Heater regulation - Signal implausible. Neither Autodata or RMI technical departments seem to be able to give any more details. The CO is high; 1.616 and Lambda low; 0.951, HC is normal at 4000 rpm, at idle the CO drops to 0.285. It looks like front lambda sensor from emissions but if any one has come across this any help would be great, thanks.