Need help. Started 2004 coupe and brake wear indicator, ABS, BAS, brake, check engine light all lit on dash. The spoiler went up and spoiler switch has a blinking red light. Car has been sitting for several months with a battery tender attached to its battery. Any help is much appreciated.

 

Tender or not, all symptoms indicate a weak battery. How old is it?

 

Not sure how old the battery is. I've had the car for 5 yrs. I checked the battery (12.78v 710 CCA). When I hooked up the negative lead of the battery tester the negative battery connection to the frame seemed the move, possibly a little loose. I removed the negative cable, clean the terminal, let it sit for about 45 mins. Then reconnected the cable and ALL IS WORKING! Hopefully that was the problem. Thanks for your help.

 

Batteries usually last about 4 years as far as I know. After that the cells decay and so does the ability to hold a charge. I would suggest changing your battery.