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Trouble codes for 2003 Chevy Blazer

Check Engine Soon light stays on. Code reader showed problems with codes PO128 & PO155. I fixed PO128 (replaced thermostat and cleared the trouble code. But how do I fix PO155 and then clear the code?

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  • Anonymous Mar 22, 2014

    The codes were p0395 poo24 po155 po128 p1721

  • Anonymous Mar 22, 2014

    The codes were p0395 poo24 po155 po128 p0128

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  • Cars & Trucks Master
  • 21,873 Answers

Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two.
Usually the sensor is faulty, but the heater circuit would need to be checked to be sure. The sensor has a built-in heater to get it hot quickly after starting the engine.

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

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SOURCE: 1996 Chevy Blazer check engine light on

More then likely its the Canister Purge Solenoid. you can find it online at www.autozone.com the part number is PV140. And to replace it on blazer you have to remove the spare tire. Alot of people don't know where this part is so I hope this helps you and good luck.

Posted on Oct 14, 2008

SOURCE: P0420 and check engine light

A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

Posted on Apr 18, 2009

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SOURCE: pcm trouble codes? How do you get them to clear?

you can usually take to neares advance auto or autozone and ask them to clear check engine light and presto code gone

Posted on Apr 21, 2009

  • 7353 Answers

SOURCE: po452 trouble code changed sensor engine light

you may have to drive it several days for the light to go off, or have the codes cleared. personally I would just drive it. if the computer tests it, and it passes the test, it will go off on its own.

Posted on Sep 21, 2009

  • 12153 Answers

SOURCE: 2002 blazer zr2 check engine light code is po155

P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter

Posted on Feb 23, 2010

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Code po128 on 2007 mercedes c class230


Did you clear the code after replacing the thermostat and it came back? If you didn't clear the code, do so. If it came back the problem could be a faulty coolant temp sensor. That is the next thing to check.

Sep 14, 2014 | 2007 Mercedes-Benz C230 Sedan

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2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

2 Answers

I got a PO128 reading I changed the theromstat but the engine light is still on what can I do to get the light off


When the Check Engine light comes on,you need to clear the code, either use a scan tool to clear the code or you can use 3 consecutive ignition cycle,that the diagnostic runs and not fails, Or A history of 40 consecutive warm up cycles if no failure are reported by this or any other emission relateddiagnostic, If the relacement thermostat and you cleared the close and this code appears You need to inspect the ECT sensor or even the ECT harness

Nov 26, 2012 | 2005 Chevrolet Equinox

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The check engine code p0505 showed before so we changed the iac along with the throttle body, had the alternator checked it still good, but now the light stays on with that code. what should we do? we


It may be fixed & it may not be

Who did what,how & why

A code reader is what you need if your
working on your own car
$60.00 is nothing for that,use it to clear
codes,generic codes is all it will retrieve,'
not the ones you may need to diagnose
they are manufacturer codes

To change a throttle body is going too far
I think

Explain

Nov 25, 2012 | 1997 Mitsubishi Galant

1 Answer

Check engine light on. Won't stay off. OCD code is po442 po128 coolant.


Just fixed mine with the same code and gm tech advised me to change thermostat which is not a fun job as it is located in the LOWER hose and comes with a gooseneck assembly and O ring.The temp sensor could also be the problem but was told not likely so got by with just thermostat!

Nov 03, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

My check engine light is on and I can't pass inspection because of this problem. The code that appears is po128. What exactly does that mean?


The generic code stands for Coolant Thermostat (the Coolant Temperature is below the thermostat regulating temperature) Need to replace thermostat according to that it is opening too soon.

May 06, 2010 | 2004 GMC Envoy

2 Answers

What does code: PO128 mean? I plugged it into the diagnostic machine, and that's the code that popped up.


A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
The most common cause is a faulty thermostat. However here are some suggestions on troubleshooting and repairing:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat

Nov 20, 2009 | 2007 Chevrolet Silverado 2500HD

1 Answer

Showing a engine service soon


The code that it is throwing is P0128, "Coolant Temp Below
Thermostat Regulating Temp. If your car is not running hot try this. If it is running hot take it to the shop or replace your thermostat yourself this is probably the problem.
Simply disconnect your battery, turn on the headlight switch for about five to ten minutes, and re-connect the battery. This is pretty simple, but will likely result in you losing your radio presets and perhaps some other small things like that.
This will reset your light. If it comes back on your thermostat or temper sensor may be bad.
Good Luck Hope this helps>

Jan 18, 2009 | 2007 Nissan Sentra 2.0 SL Sedan

1 Answer

Po128 code on 2001 corvette


replace the thermostat. computer sees engine is running too cool thermostat stuck open.

Nov 10, 2008 | 2001 Chevrolet Corvette

2 Answers

Check engine light is on


this is a coolant below threshhold code meaning engine is running too cool. change your thermostat and will fix problem. if you cant clear code after a few drive cycles the computer will cut light off once it sees problem is corrected

Sep 12, 2008 | 2000 Jeep Grand Cherokee

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