OK, that's interesting since the rearmost sensor is only a 2 wire unless I'm missing something. I see the round one with 4 leads immediately in front of the rear sensor.

What would be really helpful is a pin out of the 14 pin connector on the firewall.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250