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Check engine light

Check eng light wont go off i read the codes they were PO128 & po101 so i changed antifreez and installed new air filter then i removed MAF Senser cleaned also then i took scanner & cleared the codes and now i dont have any codes but engine lgt still on i also disconnected battary 4 10 minutes the light still on and no codes ???????

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  • Cars & Trucks Master
  • 21,873 Answers

When you begin the scan, does the scanner tell you the MIL is on ?

Posted on Apr 23, 2013

Testimonial: "yes"

6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

sir fixalot
  • 146 Answers

SOURCE: Check engine light

Those codes do appear to deal with the mass airflow sensor. The MAF sensor is probably the "hot wire" type where a thin wire is suspended inside the body of the sensor and is heated with electrical current. The amount of air passing over the wire is directly proportional to the resistance of the wire and that resistance data is calculated. The MAF sensor, by itself, cannot determine the air mass supplied to the intake plenum. One or more other sensors are used in conjunction to equate these values. The oxygen sensor(s), Manifold Absolute Pressure (MAP) sensor, the Intake Air Temperature (IAT) sensors may all play a part in this fault reading.

There are reliable methods to test the MAF sensor. One well takled about method is to tap the MAF sharply with a screwdriver handle while the engine is running. If the engine dies, the MAF is faulty. This can detect a physical defect in the wire and a few other things but do do assume that, after repeated blows to the MAF with your dead blow hammer for good measure, that the MAF is at 100%. I will research some text on testing these sensors on that particular model and post links to any information and diagnostic data I find.

Posted on Jun 04, 2008

  • 166 Answers

SOURCE: 99 explorer running rich check engine light wont come on

coolent temp sensor to pcm . the truck thinks it cold and its riching the fuel mixture . its a cheap part . i would have a good shop with a good scaner check it fist but thats up to you

Posted on Jun 12, 2009

  • 96 Answers

SOURCE: I have an engine miss,****,buck at about 45 mph

Change plug wires next and put in some SeaFoam. This sounds like a tune up issue... just run though the paces.

Posted on Jul 29, 2010

  • 59 Answers

SOURCE: 2002 impala 3.8L 180,000kms. Having

it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.

Posted on May 14, 2011

nicole99wu
  • 1049 Answers

SOURCE: changed the TPS on my 05 sedona and it reads P0122

this code may cause by:

TPS not mounted securely.

TPS circuit short to ground or another wire.

Faulty TPS.

Damaged computer (PCM).

to fix this code you can try this:


Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.

Posted on Aug 02, 2011

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1 Answer

Po101 code


Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. Check for air leaks on or around any intake pipework using a good spraying of carb cleaner, if the engine surges then that's the leak. Check wiring to Maf and if the inside is dirty, again use carb cleaner liberally...NOTE: do not use Wd40... If the code comes back, it may be necessary to replaced the mass air flow sensor.

Jun 04, 2014 | 2000 BMW 3 Series

1 Answer

2006 Volvo xc90 trouble code po101


did you reset code,any vacuum leak.

Mar 08, 2013 | Cars & Trucks

1 Answer

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

2 Answers

What cause accelerate power loss


CODE SCAN FOR FAULTY TPS SENSOR.IF TPS SENSOR BAD YOU WILL SEE CHECK ENGINE LIGHT FLASH ON.A BAD TPS SENSOR WILL CAUSE HESITATION DURING ACCELERATION. IF TPS SENSOR OKAY NO CHECK ENGINE LIGHT FLASHING. DIRTY FUEL INJECTORS AND STOPPED UP FUEL FILTER WILL CAUSE SAME PROBLEM.

Oct 21, 2011 | 2001 Oldsmobile Aurora

1 Answer

Po101 , po101pd, po128, po446 diagnostic codes for 2000 s10 blazer


While I don't have your specific book, the GM's of this world and many models employ similiar codes. PO 101 should be your MAF sensor (Mass Air FLow) and something equally with 101pd. The sensor itself is probably located on or near the air duct between your filter to the engine throttle body. As for the rest, they are related with the emissions control as well. Sometimes, when you have multiple sensors readouts, and you're not sure where to start, start cheap, and go from there, as sensors can trip the other sensors. Hope that helps

Feb 16, 2011 | 2000 Chevrolet Blazer

1 Answer

Had codepo101 , replaced MAF sensor, cleaned air filter. ran it fora couple miles , service engine light came back on . code po101 back. any ideas??


First make sure the air filter is new or at least clean. If you are using an aftermarket enhancement air filter (like K&N) make sure it isn't over-oiled (the oil will affect the sensors in the MAF) (mass air flow), and contaminate the reading of air volume going to the engine. If the ECM can't monitor or regulate the air flow it will set this code and ignore the input form the MAF. In some cases the MAF wiring was to blame, bad connections, or corrosion.

Jan 29, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

I am getting codes PO101, PO102, PO113, PO128, PO300. The truck is running rough, when put into gear it has almost no power. It feels like it is sucking a lot of air.


This sounds like a wiring issue. Has someone been into the wiring on the engine? MAF sensor, IAT sensor, temp sensor...and ignition system/crank sensor. PCM has probably gone to limp mode. Check your connectors on the engine and intake resonator and if you don't find any problems, please get back to us.

Oct 31, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Code po101, hard start when hot (have to hold W.O.T. to start) & stumbles on accelertion. Changed MASS sensor, no help.


Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.  I would try cleaning out your MAF sensor with some carb cleaner and reseting the check engine light to see if it comes back on.  If it does, get back on here and let us know and we will walk you through some other things you can try.  Cleaning it out will be the easiest/cheapest thing for you to try right now.  Good luck.  Thanks for an honest rating and for using FixYa.   

May 22, 2009 | 2003 Chevrolet Suburban 1500

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