Caterpillar: My “check engine” light is on, but nothing seems to be wrong. What do I need to check?

Question:

My “check engine” light is on, but nothing seems to be wrong. What do I need to check?

The engine on my ’05 VW Passat recently “flooded” while driving in low area during heavy rain. Had everything fixed and car is running perfectly. Yesterday the check engine light came on but the car seems to be running perfectly. What should I check?

Answer by shicka Jimenez
if you have the manual you can look up some reasons

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5 Responses to Caterpillar: My “check engine” light is on, but nothing seems to be wrong. What do I need to check?

Troy says:

October 20, 2011 at 10:38 am

Go to an auto parts store and have it scanned for free. They will tell you what code(s) are present and what they mean. Likely a sensor has gotten wet, tripping the check engine light. It may be able to be dried out with some WD-40, or it may have to be replaced.
William W says:

October 20, 2011 at 11:18 am

There is a data connector that a tester can be hooked up to that will tell you what needs attention. A VW dealer can do the test at little to no cost; then it’s your decision what to do with the info. Don’t be pressured into a repair until after you’ve had a couple of estimates.
yes_its_me says:

October 20, 2011 at 11:36 am

The quickest and easiest solution is to have the system scanned by your local mechanic or auto parts store. Here in calif we have stores that will provide this service for free. This will tell you exactly what the problem is and save you a lot of time and guesswork. It can be as simple as a loose gas cap to a computer problem. Since you have no other symtoms than I would go with the scan.
Scott B says:

October 20, 2011 at 12:22 pm

I agree with Troy, go to your local auto parts place (Advanced Auto, Napa, AutoZone, etc) and have them scan your computer. The majority of places in Minnesota do it for free and this will be a good start for you.
dr.Quirky says:

October 20, 2011 at 1:02 pm

most likely a wet/damaged sensor , once oil/water levels are good and thermostat is functioning right there is no proper reason for it, best bet get a dealer to run a diagnostic , all new VW’s hav a handy elec diag, a dealer/garage should be able to run it for free and then you can do what you need with that info