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Ron Z.
Ron Z., - Honda Tech -
Category: Honda
Satisfied Customers: 19033
Experience:  18+yrs experience. State Inspector and Honda Diagnostics
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Check engine light is on, Stay on, 2005 Honda Civic, Nothing

Customer Question

Check engine light is on
JA: Does the light stay on, or does it blink?
Customer: Stay on
JA: What is the model/year of your Honda?
Customer: 2005 Honda Civic
JA: Are you fixing your Civic yourself? What have you tried so far?
Customer: Nothing yet. Could a bad battery cause it
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not yet
Submitted: 2 months ago.
Category: Honda
Expert:  Ron Z. replied 2 months ago.

Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron and I'll be working with you on your question today.

Are you experiencing any engine performance symptoms like skipping or stalling?

Customer: replied 2 months ago.
It takes it a couple of times to start
Expert:  Ron Z. replied 2 months ago.

Ok. Great. Thank-you. Please give me one moment to type out some info for you. Sit tight one minute... I'll be right back!

Expert:  Ron Z. replied 2 months ago.

When the Check Engine light comes on, this is the on-board computer's way of telling you it sees a problem in one of the monitored systems. Unfortunately, there are literally 100's of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible. However, if you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions control/recovery) system. Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running can set the light. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly. Check the top of the fuel filler neck for any signs of damage or debris. Check under the vehicle, around the rear areas of the vehicle, looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. If these all check out, then the best thing to do at this point is to have the Diagnostic Trouble Codes (aka "p-codes") read from the on-board computer. These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor, in which system, has the fault. Every single Mechanic's first course of action will be to obtain the p-codes. It's standard diagnostic procedure. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the correct repair. You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc).

If you are having hard-start issues, this can be due to a possible vacuum leak, a faulty sensor in the fuel/air delivery system, a faulty camshaft or crankshaft position sensor, etc... As I say, we'll need those p-codes to more accurately determine.

Please be kind enough to leave a rating for our Q&A using the 'stars' at the top of the page or click 'Accept' when I have answered all your questions. A 5-star rating is very much appreciated! Rating or accepting my answer does not cost you extra.

Expert:  Ron Z. replied 2 months ago.

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Expert:  Ron Z. replied 2 months ago.

Were there any other questions I could help you with today?

Expert:  Ron Z. replied 2 months ago.

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Expert:  Ron Z. replied 2 months ago.

HI! I noticed this Q&A was still open, so I wanted to check in and see if there was anything else I could do for you on this? Any other questions you had?