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  1. Help with Check Engine Lights!

    Problems and Service
    Hey all! This is my first post so I am not sure if it is in the right forum or if anyone will be able to help me. I have a 2006 Chevy Cobalt and my check engine light recently came on. I let it go for a few weeks because I was told it was an O2 sensor and not a big deal. I got it checked at...
  2. P0300...again

    Problems and Service
    About two months ago my car threw a code for a multiple misfire, I changed the coil, plugs, and wires.. None of this fixed the issue, so I checked valves and fuel related issue, still no change. Finally, I replaced the ignition control module, which fixed the issue. Now the misfire is back...
  3. Mileage and Multiple Codes

    Problems and Service
    Hi, we have a 2005, we have been seeing our gas mileage decline. It has gone from high 30s per gallon now to low twenty's now. We went to advance and had codes read. Came up with.... P0121-Throttle position sensor P0130-02 sensor bank 1 sensor 1 P0171-Bank 1 system too lean P0300-Random multiple...
  4. Code P0315

    Problems and Service
    well i had a ecm issue and had it repaired. 700.00 later the first code i got was p0601 bad ecu then got it back and code p0315 came up took it back and they taught the crank sensor. i could not rest it. then yesterday the same code but i was able to reset it. so i left the scan gage on it to...
  5. Codes Questions

    Problems and Service
    My cars been acting up lately.. ran diagnostics on her and i got these codes. P0030, P0327, and P1516. Did some research on them but wanted some opinions and possible fixes from people with Cobalts. any tips on how to fix them etc.?