Please help? PO135 X 4?

[WyoBmw328i]

I have a 96 328I. Need new o2 sensors I think?. Question i have; is the 02 heater circut ran by the same relay or anything? Im getting a trouble code stating a o2 heater circut error but the funny thing is i get three trouble codes at the same time for three different o2 sensors. ?? Do i need to replace all o2 sensors or is this some relay that runs all 4 of the O2 sensors heaters? Please help!? Im lost.

 

[chief]

It appears it is only Bank 1 Sensor 1 (Sensor Heater Circuit Bank 1 Sensor 1) according to my dianostic program. I would assume it is only 1 sensor not all. The Bank 1 Sensor 1 is on the back connection under the fuel rail cover. Disconnect it and follow it to the appropriate sensor on the bank 1 exhaust manifold.

Hope this helps.

 

[WyoBmw328i]

Sorry i ment it also trips p0141 and po155 codes at the same time as po135.

 

[chief]

P0141 02 Sensor Heater Circuit Bank 1 Sensor 2
P0135 02 Sensor Heater Circuit Bank 1 Sensor 1
Looks as if it is only on the Bank 1 line.
Thus you have both sensors to replace for Bank 1. The sensor on Bank 1 manifold and the sensor after the CAT on the same exhaust pipe.

Good Luck

 

[WyoBmw328i]

So then P0155 is Bank 2 Sensor 2? Also they all trip at the same exact time ...
So they are all bad and there is no relay elsewhere that controls the heaters in the sensors correct ?

Ok then if I replace all 4 of the sensors it should fix the problem correct?

 

[chief]

P0155 02 Sensor Heater Circuit Bank 2 Sensor l

YEPPER