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GMC Forum: o2 sensor problems p0155
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  #1  
Old 03-26-2013, 08:21 PM
talgoo talgoo is offline
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Default o2 sensor problems p0155

I have code p0155 bank 2 sensor 1 .But I tested with two scanners they show both pre cat sensors are working, voltage .120 -.870 and .095 =.830. both the long and short ft are within proper range. Post cat sensor seem to bounce around, the other day it flat at .130 , then yesterday it was flat at .759, today it was between .350 =.550 averaging .460 which I believe is ok. I cleared the codes to get the freeze frame info. First Freeze Frame as follows,fuel sys.1 ol,fuel sys.2 ol,load %4.3, Ect 125, shrtft 1 -6.3 , shrtft 3 -99.2 ,longft 1 7.0 , longft 3 -99.2 ,shrtft 2 -5.5 ,shrtft 4 -99.2 , longft 2 3.9 ,longft 4 -99.2 . Map 6.1 ,Rpm 644 ,Vss 0 , Maf 0.02 ,Tp 0.0 .The second Freeze Frame as follows Fuel sys 1 cl, Fuel sys 2 cl ,load %2.7 ,ect 195 ,shrtft 1 =12.5 ,shrtft 3 -98.4 ,longft 1 -6.3 ,longft 3 -98.4 , shrtft 2 -10.9 ,shrtft 4 -98.4 ,longft 2-7.0 ,longft 4 -98.4 ,Map 4.5 ,Rpm 634 ,Vss 0 ,Maf 0.01 ,Tp 0.0 .I also replaced spark plugs,complete distributor with cap and rotor. I don't know what the different long and short fuel trim # ie: 2,3,4 ect. mean ,Any help is appreciated,Thanks
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Old 03-27-2013, 11:48 AM
Molson02536 Molson02536 is offline
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Quote:
Originally Posted by talgoo View Post
I have code p0155 bank 2 sensor 1 .But I tested with two scanners they show both pre cat sensors are working, voltage .120 -.870 and .095 =.830. both the long and short ft are within proper range. Post cat sensor seem to bounce around, the other day it flat at .130 , then yesterday it was flat at .759, today it was between .350 =.550 averaging .460 which I believe is ok. I cleared the codes to get the freeze frame info. First Freeze Frame as follows,fuel sys.1 ol,fuel sys.2 ol,load %4.3, Ect 125, shrtft 1 -6.3 , shrtft 3 -99.2 ,longft 1 7.0 , longft 3 -99.2 ,shrtft 2 -5.5 ,shrtft 4 -99.2 , longft 2 3.9 ,longft 4 -99.2 . Map 6.1 ,Rpm 644 ,Vss 0 , Maf 0.02 ,Tp 0.0 .The second Freeze Frame as follows Fuel sys 1 cl, Fuel sys 2 cl ,load %2.7 ,ect 195 ,shrtft 1 =12.5 ,shrtft 3 -98.4 ,longft 1 -6.3 ,longft 3 -98.4 , shrtft 2 -10.9 ,shrtft 4 -98.4 ,longft 2-7.0 ,longft 4 -98.4 ,Map 4.5 ,Rpm 634 ,Vss 0 ,Maf 0.01 ,Tp 0.0 .I also replaced spark plugs,complete distributor with cap and rotor. I don't know what the different long and short fuel trim # ie: 2,3,4 ect. mean ,Any help is appreciated,Thanks
Code P0155 is set when the O2 sensor is starting to get lazy. Start with the simple, check check your fuses (02 15A fuse - under-hood box) and grounds to the O2 sensor first because there is always that remote chance that the only issue is a blown fuse or a bad ground. Verify that there are 12-volt heater signal(s) and good ground(s) to the sensor and that the Engine Coolant Temperature Sensor is reading well within the closed loop envelope and that its readings don't go below 160 F when the vehicle is driven, especially above 60 KM/H = 45 MPH.

If there good then switch the O2 sensor from left to right sensor and see if the codes change to P0135 which is a Bank 1 sensor 2 heater malfunction. If the codes change, then replace the O2 sensor

Hope this helps

Molson02536
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Old 03-27-2013, 07:50 PM
talgoo talgoo is offline
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Default o2 sensor problems p0155

Thanks for the reply, did you notice that the code triggered once in closed loop ,then in opened loop .Does this make a difference in your assessment.In the mean time I will do the other tests.
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Old 03-27-2013, 07:55 PM
Molson02536 Molson02536 is offline
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Originally Posted by talgoo View Post
Thanks for the reply, did you notice that the code triggered once in closed loop ,then in opened loop .Does this make a difference in your assessment.In the mean time I will do the other tests.
Yes i have, thats why i am thinking its getting lazy and replacing it would address the issue. But to be sure and save time and money, switch the O2 sensors and see if there is a difference.

If there is no difference, than its going to be checking the wire harness to make sure there good and that ground is good.

Keep us posted and be safe

Molson02536
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Old 03-27-2013, 09:06 PM
talgoo talgoo is offline
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Default o2 sensor problems p0155

I just checked wiring it looks ok .No indication of water or heat damage.tested wire have ground and 12.83v Fuse is ok.Is bank 1 sensor 2 behind the cat. can they be switched with bank 2 sensor 1 that is before the cat or am I back asswords,Thanks again for your time.
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Old 03-27-2013, 10:21 PM
Molson02536 Molson02536 is offline
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Originally Posted by talgoo View Post
I just checked wiring it looks ok .No indication of water or heat damage.tested wire have ground and 12.83v Fuse is ok.Is bank 1 sensor 2 behind the cat. can they be switched with bank 2 sensor 1 that is before the cat or am I back asswords,Thanks again for your time.
"P0155 02 Sensor Heater Circuit (Bank 2 Sensor 1)" it's "the passenger side front sensor" Just swap it out with the one from the drivers side down pipe and see if the codes switch to P0135 which is (Bank 1 Sensor 1)

Spray it down with penetrating oil and use a O2 socket to remove and re-install the new O2 sensor.

Keep us posted

Molson02536
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Old 03-28-2013, 12:28 AM
talgoo talgoo is offline
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Default o2 sensor problems p0155

Thanks for the info ,for some reason I thought the exhaust ran down drivers side, so I would have Bank 1 sensor 2. But I was wrong, so would that make down stream sensor Bank 2 sensor 2.Anyways I used wd ended up wrecking sensor.I'ii pick up new one AM.I"ll let you know how I made out,Thanks again I really appreciate your help.
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  #8  
Old 03-28-2013, 07:43 PM
talgoo talgoo is offline
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Default o2 sensor problems p0155

Well finally managed to install new sensor,seems to run little better,I will drive it a day or two, Both pre cat sensors are working with in parameters,the back sensor moves slowly and moves between 650-750.It still is a little hard to start.I will keep you updated,thanks
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Old 03-29-2013, 09:37 AM
Molson02536 Molson02536 is offline
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Originally Posted by talgoo View Post
Well finally managed to install new sensor,seems to run little better,I will drive it a day or two, Both pre cat sensors are working with in parameters,the back sensor moves slowly and moves between 650-750.It still is a little hard to start.I will keep you updated,thanks
No worries about the post cat O2 sensor, its readings has no influence on how your engine will perform. The post O2 sensor is there to monitor the catalytic converter as to its condition, in short. Is the catalytic converter still working within its parameters.

Try this if your still having hard starts, cycle your ignition 3 times before you try to start the Jimmy. If it does, then there is a good chance that your return fuel pressure check valve has gone bad. The bad news is that, its a part of the fuel sending unit.

After you cycle the ignition and still having hard starts. Check your fuel pressure at the shreddar valve. You should get a reading of 62-65 psi ignition on and engine not running. Once the engine has started, the pressure should drop around 5 psi.

Keep us posted and we can go from here

Molson02536
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  #10  
Old 04-01-2013, 08:46 PM
talgoo talgoo is offline
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Default o2 sensor problems p0155

I was busy last few days. Thanks for the info . But what does it mean to recycle ignition.Also I have a evap monitor Inc. with no check engine light on.
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