O2 Sensors with MAP

[PSIKO]

G'day,

are the O2 sensors required when you're running a MAP sensor? Just curious as mine have been unplugged

I know they're partially for small adjustments to afr's, but didn't know whether that was just for MAF equipped cars or not

Cheers fellas

[RB30-POWER]

O2 sensors are used for "closed loop" feedback fuel control.

Basically most modern EFI systems use this sensor to give the ecu feedback about the fuel mixtures under light load operating or cruising conditions.

This helps fuel economy and allows the cat to minimise emissions considerbly.

Now some aftermarket ECU, dont use closed loop, so therefore you wouldn't need o2 sensors hooked up.

Microtech are a good example. They don't used closed loop. (Well the old models don't anyway)

Most other aftermarket ecus do run closed loop, such as powerfc etc etc. (Most good units you can choose to enable or disable closed loop)

What managment does your car run?

[PSIKO]

Have a Motec M8

So I'm assuming they weren't needed then

Thanks for the excellent explanation RB30-POWER, was just something puzzling me!