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DTC Codes

Tiny
DWCBUBBA
  • MEMBER
  • CADILLAC STS
I have several DTC codes (1997 STS)
P0404, P0420, P0741, and P1660

How do I trouble shoot these codes and what do I need to do to correct them?
Saturday, March 3rd, 2007 AT 7:57 AM

1 Reply

Tiny
CHEVY22
  • MECHANIC
  • 1,375 POSTS
Hi
p0404 is a generic egr fault, p0420 is twc system low efficiency, this could be a multiple items, 02 sensors, backed up converter, p1660 is the cooling fan control circuit this could be firing to the fan or the fan, fan relay or incorrect ground in the pcm, and the p0741 is the torque converter clutch is stuck off, this will most likely be an overhaul of the transmission, very common, sorry for the bad news

thanks
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Saturday, March 3rd, 2007 AT 1:07 PM

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