My 09 Chevy cobalt has check engine light on I changed sparks plugs. Coil plugs and still idles like it wants to shut off?

Asked by Mar 20, 2017 at 01:36 PM about the 2009 Chevrolet Cobalt 1LT Sedan FWD

Question type: Maintenance & Repair

2 Answers


You need to get the vehicle scanned for trouble codes to know what to fix. An auto parts store will do this for you. Write down the codes.


I have a 05 cobalt, when I first bought it a couple of months ago, it had the same problem. The problem was easy to fix. It had about 120,000 miles on it and the fuel injectors had some sludge built up in them. I filled the gas tank premium (expensive) gas, which may or may not have helped, and poured about half a can of seafoam brand fuel injector cleaner into the gas tank. The car spit out some black smoke from the exhaust pipe for a little while (burning off the carbon build up in the engine and fuel system). And thats it, problem fixed. I would still have the auto parts place check the engine codes while your there. But hopefully it's just an easy fix.

Your Answer:

Chevrolet Cobalt Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Chevrolet Malibu
45 Great Deals out of 1,976 listings starting at $2,390
Used Honda Civic
117 Great Deals out of 4,891 listings starting at $100
Used Ford Focus
48 Great Deals out of 2,526 listings starting at $2,534
Used Chevrolet Impala
18 Great Deals out of 1,005 listings starting at $2,994
Used Chevrolet Camaro
6 Great Deals out of 999 listings starting at $4,500
Used Ford Mustang
21 Great Deals out of 1,216 listings starting at $5,995
Used Toyota Corolla
115 Great Deals out of 4,251 listings starting at $2,300
Used Honda Accord
35 Great Deals out of 1,625 listings starting at $1,800
Used Honda Civic Coupe
38 Great Deals out of 1,037 listings starting at $2,411
Used Toyota Camry
26 Great Deals out of 2,105 listings starting at $2,995
Used Dodge Charger
39 Great Deals out of 916 listings starting at $4,490
Used Nissan Altima
36 Great Deals out of 1,241 listings starting at $2,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.