What does this control?

[fabby318is]

Can anyone tell me what the blue relay located on the bank of three relays on the firewall controls (next to the fuel pump relay)? :confused:

It's driving me crazy as i thought it was some O2 sensor related relay and thought it would not prevent the car from starting, but i guess I'm wrong as the car will not start with the bad blue relay in place.

Thanks guys,
Fabby

[D. Clay]

According to the diagram in the E20 Repair Manual you can download here,
http://www.m42club.com/forums/showthread.php?t=964&highlight=Repair+manual the relays are  Master, Fuel Pump, and O2 Sensor.

[ScentOfGasoline]

colors are not important.
the middle one (4 prong) is the fuel pump relay.
the 5-prong one to the pass side is the main relay.
the remaining one (4 prong) is o2.

[fabby318is]

Thanks guys, looks like i got the main and the O2 relays mixed up.

All is well, she's back up and running!