P0156 & P0136 HELP!

[97RedGT]

P0136- Downstream Heated Oxygen Sensor circuit fault - Bank No. 1.
P0156- Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.

I have mil's for my o/r x and didn't get these codes until be dropped the pipe a couple weeks ago. Is it possible that my mil's just went bad on me or is there somthing else i should look for. I find it hard to beleive that both mils went at the exact same time. If the mil's were fine but the o2's themself were bad would changing those help anything?

 

[reivaxtorres]

no, wont change anything. go back down there and make sure all the connections are clean and that they are attached, that none of the wires got loose

 

[97RedGT]

If it were the mils being bad/disconnected w/e wouldn't it give me a code for malfunctioning cats?

 

[reivaxtorres]

yes and no. in this case, its not telling you that they arent there or that the cats arent working, its telling you there is a problem with the signal they are sending. check out this site: http://home.comcast.net/~miracerros/dtc_powertrain_1.htm


P0136 & P0156 :

CODE: What they mean: Possible cause:

0136 - HO2S Sensor : The downstream HO2S : * Pinched, shorted, :
: Circuit Malfunction : sensor(s) are : and corroded wiring :
: (HO2S-12) : continuously checked : and pins. :
: : for maximum and : * Crossed sensor :
: : minimum voltages. The : wires. :
: : test fails when the : * Exhaust leaks. :
: : voltages fail to meet : * Contaminated or :
: : the calibrated limits. : damaged sensor. :


: P0156 - HO2S Sensor : See DTC P0136 :
: Circuit Malfunction :
: (HO2S-22) :