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2002 Cadillac DeVille DTS 4.6L MIL Lamp on
Posted to GM Driveability on 9/27/2007 6 Replies

Thanks in advance for your help. Car came in originally with both o2s switch identically. Car has no drivablity issues. Fuel control is plus or minus 2%. We sold the cat and now cat lights off and second o2 flat lines but code still returns within a week. Is t...

6 Replies Received (View Replies)

  Related Documents & Media  2002 Cadillac DeVille DTS

 
Message Closed w/Summary

car Vehicle Data

2002 Cadillac DeVille DTS

VIN 1G6KF57982
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
Misc.Dts

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed w/Summary

car Vehicle Data

2002 Cadillac DeVille DTS

VIN 1G6KF57982
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
Misc.Dts

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)