which wires do i check the voltage on, and whats the correct tolerances.

1998 v4 wrx import - one o2 sensor on downpipe

thanks matt

 

white wire with red is signal live . should be up n down aqll the time 0.2-0.9v use a multi meter with digital display .

 

thanks, by any chance, do u know what wires from the senor correspond with wires on car?

 

check the block connector . found under expansion tank . 3 pin male female plug , if in dought earth the meter , 2wires are heater wires 1earth 1 12v poss . then the 3rd wire will be the signal wire 0.2/0.9v varies all the time ,bosch multi fitment 02 sensor is 47quid from HGL Motorswww.hglmotors.com

 

its a long story, i had a o2 sensor, but put it on a car i worked on as i was rebuilding engine. and fitted exhaust for them and their o2 sensor was welded in.

they didnt replace it, so bought another, that was wrong block connector, so got another one, but block connector was burnt a bit, so removed all pins and fit them into my block connector as they came off. just wanted to make sure its all ok.