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Ive got a 97 C5 with about 97k miles (freaky..).
The Check Engine lightcame on a day ago. I looked up the codes that came up in Diagnostic Mode.
10 - PCM
P0410: AIR System
P1571: ASR Desired Torque
Not sure how serious a problem this is...was wondering if it was time to change out the O2 sensors or is this a bigger issue.
I had the PO410. The issue was water in the air pump. this was caused bymny aftermarket air box. Dealer replaced the air pump. I had to fix the little hose that was letting the water in.
Sorry I do not know abour P1571.
Good Luck