Hi

I have a 1993 JDM WRX fitted with a Bosch LS04 3-wire lambda sensor. When I measure the voltage across it, it reads a fairly constant 3v. A bit confusing since it should only read between 0 and 0.9v. When I rev it, it will go down to about 2.9v. Any ideas as to why its reading 3v??

Thanks

 

Because it's ****'d??

I have the same MY and use a LS02 3 wire??

 

well said

 

Just had a look at just lambda and they only recommend the LS01 and the LS02 for 1 and 3 wires respectivly. You may have the wrong sensor fitted

Just a thought, you are taking the voltage from the 'signal' wire and not across the heater - (neg) and +(pos).

 

Yes taking voltage from the signal wire. I looked on here and from previous posts Scott.t says either LS02 or LS04 is fine and they are both 3 wire sensors???

 

Saw the same post earlier, after i'd posted
Can only suggest it's fudged.

 

volts should swing fairly rapid when rev'd, it the volt's are slow to change then it's buggered anyhow, 2 types of common lambda make sure it's the correct type