Good afternoon everyone.
I have a fiat punto from 1998 and want to test the lambda probe.
It has 4 wires . How much do you have to measure the probe's resistance?
How do I know if it's good or not?
It is a fiat punto 176 1200cc 16v from 1998 85cv

Fist question is, is the EML, engine management light on? do you have a code reader your car may have a OBD2 port, not all early cars did, but if yes you can use this, say, to read the codes/faults; Autel (MaxiScan MS309) OBD-II Code Reader / Scan Tool: Amazon.co.uk: Car & Motorbike

two wires should have 12v( +12v and 0v-earth- (heater supply)) when the ignition is on, the other two send the signal back, not sure what resistance it is but if its open circuit its had it.

joaolopes said:

Good afternoon everyone.
I have a fiat punto from 1998 and want to test the lambda probe.
It has 4 wires . How much do you have to measure the probe's resistance?
How do I know if it's good or not?
It is a fiat punto 176 1200cc 16v from 1998 85cv

Click to expand...

Hi,
youtube should give a good general guide,

4 wires - means it has a heater element as well as power and feedback,


does your car have 2 x probes,
:idea: if so swap them around and see if the error ( fault code) moves position..,
Charlie