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Chevrolet Blazer Trouble Codes

My blazer is reading a PO128 code for check engine light.Does anyone know what that is?
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Comments

  • jlflemmonsjlflemmons Posts: 2,240
    I believe that is in the coolant temperature monitoring circuit. Maybe a bad temp sensor?
  • My Blazer had a smog test and it did not pass because of the temp sensor (coolant sensor p0128 code) we purchased the part and need to find out where it is located so we can change it.
    thanks for any help
  • repairdogrepairdog Posts: 948
    Drivers side under hood between the rear 2 plugs - see the connector attached to it. You will lose coolant when removed so make sure you refill.
  • rubiscorubisco Posts: 3
    Hey All, my first post here!

    So I have 2 '95 Blazers. My old one I've had for eons and although it's had some of the regular problems I like it very much. So I pick up another and it's throwing some codes but running good. They are P0326, P0441 and P1406. Now I know that 0326 is knock sensor performance and 0441 is no flow during evap purge cycle, but I'm not sure what 1406 is for. It's not in my haynes manual and I can't find much on the web for it. Some have said it's a bank 1 post cat O2 sensor thing.

    Ok, I was changing the cap and rotor and noticed that some knuckle head broke off the rear stay for the dist cap screws. So I have 2 wood clamps on there. Could this set off the knock sensor? Or do these just go bad and need replacing? I'm not sure where it is if it needs replacing.

    I don't know much about how the evap system works, but I heard there is a valve somewhere that can be replaced and also a canister. Otherwise this smoke test a shop can do. I just don't know where the valve and canister are located. Any ideas?

    The 1406 code?

    I guess I should add that the EGR valve was getting all gunked up with carbon pellets so I took the plenum off and cleaned it up real good and thoroughly cleaned the passages to and from the EGR. Then I put on a filtered gasket to stop any more pellets from getting stuck. I read somewhere that it could be that the IAC needs a cleaning too (?). I've run a bottle of seafoam through the tank and the intake and it idles very very smooth now.
  • repairdogrepairdog Posts: 948
    1406 is EGR. That evap can is rear drivers side way back behind the rear wheel under that shield.
  • rubiscorubisco Posts: 3
    Thanks very much man. I'll take a good look at both of those and post if I still have a problem. You seem like an extremely knowledgable guy. Thanks again.
  • I just recently got my service engine soon light coming on. I thought originally it was bad gas because it was right after I got gas, within 15 minutes. After my store stop I added the same amount of gas from a different station. Light stays on. runs ok. Is there a manual way to get the codes on this vehicle or do I need a reader. I know my other vehicles you had to do a succession of key off etc. I would appreciate any help.
  • repairdogrepairdog Posts: 948
    No, need a code reader and Advance and AutoZone read for free as well as many other local stores (in hopes of selling you parts). Read it out and maybe just a simple loose cap so write the code down and have them erase it and see if it returns.
  • I get code 1406 I repaced the fuel injection spider it ran good for the few miles then started missing and 1406 code so I replace EGR valve ran good a few miles the started missing and 1406 again engine is missig and exhaust smell of unburned gas.
  • Does anyone know what this code is or where the sensor is located? My Chilton is worthless!

    Thanks..
  • jlflemmonsjlflemmons Posts: 2,240
    P0141
    O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

    Probably in exhaust pipe just behind the converter.
  • bptbdbptbd Posts: 1
    I am working on a 2000 chevy Blazer and the error code that came up was P0147. It says that it is an oxygen sensor. Does anyone know what (out of 3) oxygen sensor this may be? Thank you in advance.
  • I recently had my check engine light come on and upon checking it with a pocket scanner came up with a DTC P0155 (O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1). My Chilton Manual says my 2002 Chevy Blazer 4.3L V6 has more than one oxygen sensor. My questions are

    1. Is this the sensor located on the exhaust pipe near the catalytic converter?
    2. Is this difficult to replace?
    3. Any tips to make the job easier (special tools, etc.)

    Thanks

    Lance J
  • Hi Lance. I think you are right about the sensor location near the converter. I usually go to Auto Zone for diagnosis and parts. They can tell you exactly where it is located and the part is about 1/3 of a GM replacement sensor. I buy Bosch replacements for my 96. It's a simple job. Just unplug it from the wiring harness and use an open end wrench. Start it up first and let it run for a couple minutes before changing the old one. This helps break the old one loose. Don't run it too long or you'll burn yourself. The new sensor usually has anti-sieze already applied to the threads. If not buy a small tube. It makes future replacement much easier.
    If you have a set of ramps you can drive up on them for easier access. I usually don't use them and don't have a lot of trouble if I suck my belly in. ;)
  • i have codes po131, po151, and po300
    any suggestions on what I need to check?

    thanks
  • beersbeers Posts: 2
    I have a 93 chevy blazer,can't really afford a diagnostic check so I had a friend do it for me at work,the codes are 32,33,35,45 can anyone tell me what they mean,please cause I can't find anyone to help me
  • hello,
    32-egr circuit
    33-map sensor
    35-iac (idle air control) valve
    45-o2 sensor (rich fuel mixture)
    sounds like you should have a performance problem. If i could suggest... IF truck is running o.k. right now, clear codes out, drive for a day, recheck your codes. you have so much going on there with the codes, and you don't know if they all came about at the same time, or not. maybe one or two have been present for weeks,months,etc. just disconnect neg. side of battery for minute or so to clear codes. then drive it for a day, making sure you start and stop engine(keystarts) approx. dozen times. have friend check codes again. it's possible that one major problem kicked other codes on, in response to the original problem(i hope your able to follow my dribble :) this would be the least expensive way, rather than replacing all that shows bad. it's possible not all sensors,etc. are bad...
    i hope i helped.
    good luck :D
  • renokyrenoky Posts: 1
    My "service engine soon" light came on a couple of days ago and has stayed on. I tried taking off my gas cap and putting it back on tightly, but it still is on. My other gauges show normal readings and I haven't noticed any other problems yet. I live in Kentucky and do not have to test for emissions here. Could it be anything else? Any ideas would be appreciated.
  • you need to get a diagnostic check. If you don't have access to a diag. tool, I believe autozone does that for free. Get the trouble codes stored in the pcm out so you know where to start...could be one of hundreds of problems.
  • OK FIRST CAR GAVE ME CODE FOR MISSFIRE #1CYLENDER CODE CLEARED THEN 2OR3 DAYS LATER CAR WAS RUNNING JITTERY ON THE FREEWAY AT CRUISING SPEED PUT INJECTOR CLEANER IN DROVE FOR THIRD OF TANK STARTED HAVING LACK OF POWER THEN POWER WOULD KICK BACK IN AND DRIVE FINE. I PARKED , THEN CAME BACK 2 DAYS LATER CAR FIRED ON 1 OR 2 CLENDERS THEN DIED CHECKED FOR CODES NO CODES CRANKES BUT WONT START. FUEL TO RAIL SPARK NEW CAP ROTOR PLUGS USED STARTING FLUID DOWN THROTTLE BODY NO START, NO CODES WOW I AM AT A LOSS IS IT THE ECM OR JUST THE CRANK SENSOR OR ONE OF THE OTHER SENSOR OR A COBO OF SENSORS BUT WHY IS THERE NNO CODES GIVEN
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