Question about 2003 Chevrolet S-10

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2003 S10 service light is on

The service engine light is on chevy 2003 S10, 3,8 liter V-6 I had advance auto check with scan tool and all clear. do i need a scan too to clear the service light.

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Yes advanced auto or autozone can reset this light with a scan tool for nothing. You can also do this yourself if you disconnect the battery cables for 5 minutes then reconnect them start your vehicle and let it idle with everything off including the radio and fan blower. Let it idle for 2 to 3 minutes to reset the computer. Provided there are no fault with your car the light will be off and stay off. If not then there is a problem and you would have to have it checked once again with the light on. I hope this helps. Don.t forget to rate my answer, thanks.

Posted on Feb 28, 2009

  • Frank Russo Feb 28, 2009

    For you info. If this is a service engine and not a check engine light then your manual will show you how to extinguish it. If you do not hace the manual just call the chevy service dept. and ask them, they will tell you with no problem. Some cars have this service engine light to remind you to change your oil or some other maintenance item. This light will come on about every 3000 to 4000 miles.



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The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.


Mar 01, 2009 | 2003 Chevrolet S-10

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