Check engine light is on, but the car is running fine. Is there a reset button for the computer that I can try? Chevy Impala 2003

check fuel pressures, clean and test injectors, replace HT leads with quality units

It sounds like your thermastat is stuck open. The check engine light will come on if the vehicle does not come up to operating temperature

I want to reset the low tire pressure light on my 2003 chevy impala. I go into the stereo disp. button, but the option is not there. How can reset it without using the stereo?

On a Chevy Impala or Monte Carlo with indirect TPMS, a totally different reset procedure is required. You can use the light switch or radio to reset the system. With the light switch procedure, turn the ignition on (engine off), the turn the light switch from OFF to parking lamps three times within five seconds. With the radio technique, turn the ignition on (engine off). With the radio off, hold the DISP button until “SETTINGS” is displayed. Use the SEEK button to scroll down the menu until you see “TIRE MON.” Press the PREV or NEXT buttons until “RESET” is displayed. Then press the DISP button again. You should hear a chime and see “DONE” to indicate the TPMS system has been successfully reset. Use the SEEK button to scroll through the menu until “DONE” is shown, then press DISP once more to exit from the learn mode.
Thank you for using fixya and good luck

The code in the ECU might not have reset after you changed the EGR. Try unhooking the battery and let the car sit for a couple minutes and then hook it back up and see if the light goes away.

I suggest changing your egr valve. I have a 03 impala with the same problem and check engine light came on and through the code for the egr valve. they are 154 at autozone

Start with the simple and replace the fuel and air filter, also check the fuel pressure regulator vacuum line and clean the MAF sensor with MAF cleaner. Start with these easy things to check and hope will bring your car back to running 100%.

Though all of these TPMS applications use a similar technology and strategy to detect a low tire, there is no common reset procedure. GM is probably the worst, with 10 different reset procedures depending on the application. Toyota is probably the best, with only one simple reset procedure for all of their indirect TPMS systems (though a slightly different procedure is used on the Lexus models).

TPMS reset procedures may also be found in the vehicle owner’s manual (if it hasn’t been lost). Open the glove box and check the index in the owner’s manual for any TPMS information.

CHEVY IMPALA &
MONTE CARLO
On a Chevy Impala or Monte Carlo with indirect TPMS, a totally different reset procedure is required. You can use the light switch or radio to reset the system. With the light switch procedure, turn the ignition on (engine off), the turn the light switch from OFF to parking lamps three times within five seconds. With the radio technique, turn the ignition on (engine off). With the radio off, hold the DISP button until “SETTINGS” is displayed. Use the SEEK button to scroll down the menu until you see “TIRE MON.” Press the PREV or NEXT buttons until “RESET” is displayed. Then press the DISP button again. You should hear a chime and see “DONE” to indicate the TPMS system has been successfully reset. Use the SEEK button to scroll through the menu until “DONE” is shown, then press DISP once more to exit from the learn mode.

Good luck and this should work for you. They changed the reset procedure on the 2006 Impala.

go to autoparts store and use their scanner to scan the computer and get the code. you may have to wait until you can catch it back on again. You can try resetting the computer by disconnecting battery for 30 minutes and see if that works first

Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/

P0481 Cooling Fan 2 Control Circuit Malfunction

Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf


Best of luck.
Greg