The wiring diagram 12*19 item 17 ref: the Lambda sensor in the HAYNES manual appears to be wrong. The 4 wire sensor has the pre heat on blue/yellow - brown/green and the sensor on green/black - light blue. These should be the other way round. Sensor to blue/yellow - brown/green. I found this out when I bought one of the cheaper flying lead type sensors where you connect to your existing plug block. *****Has anyone else come across this also?*****