Question about 2004 Pontiac Bonneville

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2004 Pontiac Bonneville Check Engine Light

I have a 2004 Pontiac Bonneville and the check engine light keeps coming on. I have taken it to Auto Zone a couple of times and they say it is the gas cap. I have since replaced the gas cap and it was fine for about 10 days then the check engine light came on again. Also, when the light is on, the engine does not seem to hit on all cylinders incessantly. Could this be a transmission problem?

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  • yadayada
    yadayada May 11, 2010

    those guys at autozone are not TECHNICIANS!!!! TAKE IT TO A DEALER FOR CORRECT DIAGNOSIS

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  • Pontiac Master
  • 4,369 Answers

Do you fill the gas tank with the key on?

Try disconnecting the battery for 1/2 hour an then reconnect and drive for 10 miles. It may run rough for this period. This will clear codes from memory.

Posted on May 27, 2009

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Posted on Jan 02, 2017

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Hi, my 01 Bonneville SSEI keeps saying check gas cap, then the check engine light comes on, I have replaced the gas cap and that did'nt fix it. Any suggestions? Thanks.


Hello: You need to find out if there are any codes in the engine control module. Go to a parts store ie: Auto Zone, Advance Auto and have the codes read, they normally don' charge. If the code is for the Evap system have them clear the code and see if it comes back.

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Welcome to FixYa.com


Go to Auto Zone and they will check it for free as long as light is on




Thank you for using FixYa.com

Regards, Lee Davidian

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My check engine light just came on. I own a 1997 pontiac bonneville. What could be wrong that would make the light come on?


Before an answer can be attempted, you'll have to know what the DTC's are associated with the check engine light. Take the vehicle to your local auto parts and see if they offer free check engine light testing. Many chains do offer this as a free service. They can also tell you the likely cause of the code.

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Welcome to FixYa.com Go to the nearest Auto Zone to have the codes read, or to the nearest repair facility. Auto Zone Provides the service for free, Regards, Lee

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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

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How to clear code service engine soon 2002


you need to use an OBDII scan tool that will read any "error" codes and give you the system that will be causing the check engine light to come on. this tool will also allow you to erase the code after you have read it. write the code down as you may have to pinpoint exactly what part may have failed and needs replacing. something as simple as a loose gas cap will cause the check engine light to come on. it could be any of a dozen different emission or ignition sensors that may be bad depending on the error code. all 1996 and newer vehicles sold in the US will have the OBDII system and standard diagnostic/data link connector,which is usually under the driver side of the dash, to plug the scan tool into to read the DTC's(diagnostic trouble codes).

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My 2004 pontiac vibe check engine light just came on. car has 150,000 miles. what could be the cause?


There are to many things that can cause the check engine light to come on. Best thing to do is to go to Auto Zone and get the Car ecm scanned for the DTC codes which would indicate the issues to why the check engine light is on. It could be as simple as a bad gas cap and needs to be replaced and if that is the case, make sure your get one from the dealer and not a generic gas cap. It could also be a bad O2 sensor and Auto Zone can give you the step by step instructions to replacing the old O2 sensor with a new on with common tools and they do have that part for sale. Good luck and keep me posted, be glad to answer any more questions you may have.

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you need to get it scaned.auto zone will do it for free but most of the time it a o2 sensor or coolant sensor

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I changed the air filter on my 2004 Pontiac Sunfire because of poor fuel mileage. Afetr I changed the air filter the check engine light came on. How do I turn off the check engine light?


Check to see if one of the wire harness has become un clipped from the intake tube like the IAT which would also give you a bad fuel economy if that has become un clipped. If there is a Auto Zone around your area, have them scan the car for DTC codes. Auto Zone scan free of charge and can help you understand why the check engine light has come on. Keep me posted, be glad to help.

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