× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
2001 Buick Regal LS 3.8L MIL Lamp on
Posted to GM Driveability on 6/17/2005 25 Replies

any ideas?? both o2's appear to be switching from rich to lean .1-.8 volts.

25 Replies Received (View Replies)

  Related Documents & Media  2001 Buick Regal LS

 
Message Closed w/FIX

car Vehicle Data

2001 Buick Regal LS

VIN 2G4WB55K41
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / pfi
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

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

car Vehicle Data

2001 Buick Regal LS

VIN 2G4WB55K41
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / pfi
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)