Need help to P0135 O2 Sensor Heater Circuit malfunction

slash1978

Active Member
Dec 21, 2017
1
0
Denmark, Odense
Hi all.

Im hope someone in here can help. i have a Seat ibiza 1.2 6n 3 cyl where the engine lamp has turn on. reading the ECU give me code P0135 O2 Sensor Heater Circuit malfunction b1 s1.
i replace the o2 sensor with a new one, and reset the ECU but the error turn on after driving 10 min, the fuse seem to be ok.
the wire to the o2 sensor seems fine. my question is

1. its a 5 wire o2 sensor. red,white,gray,black, yellow, what goes for the heater + and - ?
2. it there a switch relay there control the heater circuit. can't find 12 volt on any wire. to the o2 sensor ?
 
Last edited:

cheshire cat

Full Member
Dec 28, 2002
1,813
1
cheshire
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pin 1 on pre and post cat is fed by fuse F9 (10A) --- pre cat T2 -pin5 ECU---- T4-pin 16 --- T3 to pin35 post cat T2 to pin4 ECU T4 to pin14 3T3 to pin 31 the feed is from the fuel pump relay and fuel pump primer relay not sure why there are 2 this is fed from main relay hope this is some help
 
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