96 LS400 Fault Codes

[russell the woodbutcher]

I have rectified all my fault codes apart from the sub oxy sensors and am also getting a code 56 was just wondering if anyone knew what this code is and would this be it?

P0156 (1) ..... Heated Oxygen Sensor Heater Circuit (Bank 2, Sensor 2) (2) .............. HO2S​

 

[cjsupra90]

Yeah, its a sub O2 sensor malfunction...

Im not seeing where its a heater circuit problem. If it were a heater circuit problem, then is should be a P0161 which is bank 2 sensor 2.

Try swaping the left and right sub (secondary) O2's and see if the code changes to a P0136.

If it does change, then its a problem in the sensor itself, if it still stays a P0156, then its a problem in the wiring or the ECU.

 

[russell the woodbutcher]

Thanks mate at this stage I do not have any sub O2 sensors fitted and that is why it is throwing codes 27 and 29 as well but 56 had me stuffed I got the codes by crossing the terminals in the diag box and then counting the flashes of the check engine light