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2003 Buick Regal LS 3.8L MIL Lamp on
Posted to GM Driveability on 3/5/2009 23 Replies

This is the third time that the car has come in with this code. We have replaced the converter two other times with carquest units. the temp is same from the front and rear of the converter. There are no missfire counts in the computer the fuel trims are good....

23 Replies Received (View Replies)

  Related Documents & Media  2003 Buick Regal LS

 
Message Closed w/Summary

car Vehicle Data

2003 Buick Regal LS

VIN 2G4WB52K23
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

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

car Vehicle Data

2003 Buick Regal LS

VIN 2G4WB52K23
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)