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Better get the manual looks like your going to need it.Helm is the place to buy it.You may be having Opti trouble.
What symptoms are you having besides the code?
other than the code 16, i got a code 72 , and the car stalls out in traffic. it'll be running fine, then just turn off. i can slip it into neutral and restart (usually) but it does it so frequently now that i cannot drive the car!!
could someone scan the GM tech maual and email me the troubleshooting page? the dealership is being NO help either....
someone should buy this car from me, i'm sick of it breaking down all the time. i'll make it cheap!