Question about 2004 GMC Envoy

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2004 GMC Envoy check engine light remains illuminated. Diagnostics revealed codes: P1133 and P0128. P1133 points to a heated oxygen sensor and P0128 indicates a possible defective thermostat. The O2 sensor was replaced last year (supposedly) by GM dealership; however, the problem returned. Can you direct me to the location of the O2 sensor?

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Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.

Posted on Jan 20, 2010

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P1133/oxegen sensor


MAKE SURE THE CONNECTIONS AT THE SENSOR ARE GOOD,ALSO CHECK FOR VACUUM LEAKS,HERE'S A LINK TO YOUR CODE,THE OLD SENSOR MAY BE GOOD,JUST A VACUUM LEAK, P1133 Chevrolet HO2S Insufficient Switching Bank 1 Sensor 1

Oct 17, 2015 | 2002 Isuzu Rodeo Sport S 3.2L V6 Hard Top

1 Answer

2004 Envoy Code P0128


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 thermostate if its not overheating get it to a mechanic its probly stuck open

Dec 11, 2013 | 2004 GMC Envoy SLT

1 Answer

Engine light code p1133 on a 2005 chevy colorado


P1133 CHEVROLET - HO2S Insufficient Switching Bank 1 Sensor 1xicon.jpghttp://engine-codes.com/p1133_chevrolet.htmlForum CodePossible causes- Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 shorted to Engine Control Module (ECM) ground
- Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
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- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 connector and wires

Jun 24, 2012 | Chevrolet Colorado Cars & Trucks

1 Answer

Im having a p1133 po171 po300 po175 on gmc envoy 5.3L what could be the problem


Intake manifold gasket leaking.Replace the intake manifold gaskets.

Jan 21, 2012 | 2003 GMC Envoy

1 Answer

I have a 2004 GMC Envoy with 82400 miles. My service engine soon light continuously stays on. I have had it in the shop numerous times and they have run diagnostics. I have had a tune up done, 2 sensors...


You need to let us know what the fault code(s) is. Did anyone ever give this information when they were working on the vehicle? There are many reasons for the check engine light to be turned on.

Nov 06, 2010 | 2004 GMC Envoy

1 Answer

Check engine light on 2004 GMC Envoy. Had air intake sensor replaced. Failed inspection diagnostic code came up P0128. I have been told I needed an air pump, a tune -up, injectors cleaned etc. etc., I have...


Code P0128 indicates a faulty thermostat, more than likely it is always in the open position causing the coolant to come up to operating temperature too slowly.
My suggestion is to find a different repair shop.

Oct 31, 2010 | 2004 GMC Envoy

1 Answer

Dtcdescriptionp0128andrepair


DTC P0128 - Coolant 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.

Symptoms:
You will likely not notice any drivability problems other than the MIL illumination.

Causes:
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

Possible Solutions:
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
* 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
* If Nissan vehicle, check for a TSB such as this one. The ECM may need to be reprogrammed to correct the P0128 code


Hope helps (remember rated this).

Jul 01, 2010 | 2004 GMC Envoy

1 Answer

1998 GMC Sonoma threw code P1133 02S 1/1


P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.

Apr 20, 2009 | 1998 GMC Sonoma

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