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1990 Cadillac Deville code identification

Tiny
DAN SHORT
  • MEMBER
  • 1990 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 16,500 MILES
My service soon light is on. The code given is 49-air management. I can not find this number in any of my books. Could someone tell me what this code is referring to. Thanks.
Monday, February 2nd, 2009 AT 12:27 PM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Indicates a fault with the secondary air system. Determined by oxygen sensor change when fresh air is diverted to exhaust. Possible causes: air pump, air management valve, exhaust a.I.R check valves, plumbing for system.
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Monday, February 2nd, 2009 AT 8:55 PM

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