Seicento Lambda Heater circuit fault

[OG Burrows]

Hi, I am a new member. I have a cheeky little Sei, Has anyone else had a problem with a lambda sensor heater? i think it is a wiring fault and just wondered if any of you had the same problem, thanks

 

[blu73]

Welcome to FF :wave:

Lambda do go from time to time, whats your actual problem? Why do you suspect it?

 

[OG Burrows]

Thanks for the welcome!! I got it plugged in at my mates garage, i can't remember the fault code but it said Lambda Sensor Heater Circuit, so i tried a different lambda sensor, and nothing happened so i assumed it is a wiring fault, which could possibly be difficult to track..

 

[blu73]

what are the symptoms though?

 

[OG Burrows]

Ah sorry.. I have engine light on and there is a rough idle (dunno if the idle is caused by the faulty lambda sensor) apart from that it drives okay..

 

[marcevs72]

rough idle is normally sign of running rich probably down to lambda sensor.some have 2.i have spare brand new 4 wire universal one if you need it mate.

 

[OG Burrows]

Ah thanks, i will check the wiring to it first then, i will let you know!!

 

[Diwiak]

I have the same problem, after troubles with blocked catalyst converter and decat (https://www.fiatforum.com/cinquecen...gine-failure-blocked-catalytic-converter.html), engine control light is back on (lighten up while driving) and the same error-Lambda heater circuit..) - any idea which cable try to check???? and which lambda is wrong?? (mechanic said its the first/top one, then resets ecu and its fine for now again, so probably not faulty sensor)

..and are lambda sensors intercheangeable within SPI / MPI engines????

 

[OG Burrows]

I changed the sensor which is before the Cat. (that is the only one) the light went out!! I was dead happy then later that day, on my way to work the bastard came back on.. until i get it checked i won't know if it is related..