Question about 2006 Chevrolet Cobalt

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Service engine light stays on 2006 cobalt Ls

Changed 02 sensor spark plugs gas cap and had major tune up...unplugged battery. ij dont know at this point what to do. i also get oil changed every 3000 miles. im at 94000 miles..any suggestions?

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  • Chevrolet Master
  • 53,755 Answers

Have the fault codes read for any extra sensor failures and if ok have the cpu reset

Posted on Mar 28, 2013

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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roniecon

Ronny Bennett Sr.

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SOURCE: 2005 chevy cobalt 2.2 is running rough (putting)

Number three cylinder is miss fire,it does not mean it is the coil,although it could be,remove the coil,and boot,and spark plug,inspect them to see if the plug,or boot look bad,replace the spark plug,and if the boot is burned or distorted,replace it,a fuel injector can cause a miss fire also,but change the spark plug and see if this solves the problem,if not replace the coil,if it is a dead miss,then the coil might be bad,as for the water in the fuel ,the cap is missing,,and 5 dollars worth of HEET will not hurt,also,fuel from the fuel station,can have water in it.It happens a lot.

Posted on Apr 03, 2010

Richard Delahant

  • 1201 Answers

SOURCE: 2006 Chevy Aveo Check Engine Light coming on and off

It needs a code scanner hooked up to it,to tell you why the light is on and the cause. If there is an autozone near you take it there or
call different auto part stores to find out if they do that.Without getting the code, it's just guessing what the problem is.

Posted on Jan 31, 2009

Paullycarguy

  • 35 Answers

SOURCE: cobalt no spark

I was going to say crank sensor, but you changed it. What have you done to it latley? Or did this just start? I kinda want to say PCM for some reason. Any welding done on the car latley?

Posted on Feb 26, 2009

rylee_smith

Rylee Smith

  • 8619 Answers

SOURCE: PO420 CODE ON CHEVY S10

Hi

The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.

Thanks
Rylee

Posted on Mar 01, 2009

Anonymous

  • 1 Answer

SOURCE: engine light stays o n my 2006 impala

after 3 warm-up cycles the check engine light will go out if it does not see a problem

Posted on Nov 21, 2009

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Number three cylinder is miss fire,it does not mean it is the coil,although it could be,remove the coil,and boot,and spark plug,inspect them to see if the plug,or boot look bad,replace the spark plug,and if the boot is burned or distorted,replace it,a fuel injector can cause a miss fire also,but change the spark plug and see if this solves the problem,if not replace the coil,if it is a dead miss,then the coil might be bad,as for the water in the fuel ,the cap is missing,,and 5 dollars worth of HEET will not hurt,also,fuel from the fuel station,can have water in it.It happens a lot.

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I was going to say crank sensor, but you changed it. What have you done to it latley? Or did this just start? I kinda want to say PCM for some reason. Any welding done on the car latley?

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