Last post on Jul 16, 2013 at 4:58 PM
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Chevrolet Blazer, GMC Jimmy, SUV
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#2859 of 3676 01 Blazer Emission Issue
Jan 08, 2007 (4:56 am)
OK Kiddies, heres the poop: 2001 Chevy Blazer LT, 94600 miles, auto, 4WD. I got a Service Engine Soon light (steady not blinking) this morning on the way to work. We have OnStar and they ran the GM Good Wrench Engine Diagnostic for me. It came back with the following info: Good Wrench Code PO155(or P0155) and listed it as Emission Control System Malfunction. What do I need to do since my truck has to be inspected next month. Is this something I can do or is it a Dealer/Mechanic job??? Please help . . . . .
#2860 of 3676 Re: 01 Blazer Emission Issue [jpmccr]
Jan 08, 2007 (2:04 pm)
Easy one gramps:
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
Replace the front O2 sensor on the passenger side up by the exhaust manifold - look under behind the front tire follow wires to pipe and sensor - check the wires and connector first and make sure they are connected. The rear sensor behind cat is bank 2 sensor 2. One on drivers side is bank 1 sensor 1 (only one). Advance and AutoZ read and erase codes free. About a $55 part. Confirm the code before buying the part.
#2861 of 3676 Re: 92 S10 Blazer digital display [repairdog]
Jan 08, 2007 (7:41 pm)
You wouldn't be able to explain what circuit card and where it may be? Would you?
I really appreciate your help.
#2862 of 3676 Re: 01 Blazer Emission Issue [repairdog]
Jan 09, 2007 (4:23 am)
Thanks for the information. So I am replacing the one on the front passengers side exhaust manifold. Why so many of these things?? 1 at the converter, and 1 on each side of the manifold? I guess there is a reason but beats me why. I talked to Advance and it is $56.96 (here in NJ anyway). BTW I am not that old just like the sound of it when I typed it in.
#2863 of 3676 Re: 01 Blazer Emission Issue [jpmccr]
Jan 10, 2007 (2:24 am)
As a note 99-01 have the wonderful addition of the secondary air injection pump that blows air into the exhaust manifolds for 1 minute at startup to prefire the cat (pump under radiator and lines and check valves on manifold). The O2 sensors are heated and the PCM monitors each side output vs the cat output and adjusts mixture alone with all other sensor inputs.
#2864 of 3676 Re: 01 Blazer Emission Issue [repairdog]
Jan 11, 2007 (4:39 am)
Again thanks for the information but here is the crazy part of the issue. On my way to pick up the part this morning I notice as I pull out of our development the Service Engine Soon light is out. GONE!!! So I am assuming that since our development has speed bumps, the connection must be loose. So I will check it out. The engine seems to be running fine. Go figure . . . . (I didn't want to spend $57 any way this weekend. TOO cold to be crawling around underneath a truck!)
#2865 of 3676 CPI INJECTOR
Jan 12, 2007 (9:21 am)
i AM WORKING ON A 93 BLAZER. i HAVE 69 PSI FEUL PRESSURE. i HAVE USED A NOID LIGHT TO CONFIRM THAT THE INJECTOR IS RECEIVING VOLTAGE FROM THE ECM. A MECHANIC TESTED THE INJECTOR OUT OF THE VEHICLE AND WE CAN HEAR IT AND FEEL IT RUNNING. I HAVE SOAKED THE POPPETS IN CARBERATOR CLEANER OVERNIGHT. STILL NO FUEL?
#2866 of 3676 92 Chevy S-10 blazer 4x4
Jan 13, 2007 (10:20 am)
I having problems starting my truck in the cold it only happens when it gets cold. If I start it by crossing the starter it will start up (like touch the positive on the negitve nuts on the start it will start right up)other then that once i get it started and go some wherethen park shut off i have a problem restarting it it take several turns of the ignition before it starts back up. the starter i have is brand new maybe 2 months old the starter will click when the key is turned but the flywheel does not move till i cross the starter if anyone has any ideas it would be helpful
Thanx Frustated Auto Guy
#2867 of 3676 Re: 92 Chevy S-10 blazer 4x4 [jtheif]
Jan 14, 2007 (4:30 am)
Same as other reply.
#2868 of 3676 Re: CPI INJECTOR [kduffy]
Jan 14, 2007 (4:35 am)
Thats pretty high almost like a pinched off return line. Normal at KOEO is 60-65. The prime circuit is not same as run so check the fuel pump fuses (believe ECM related ones on these older ones) and relays.