× 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
1999 Chevrolet Blazer 4.3L MIL Lamp on, P0420
Posted to GM Driveability on 11/8/2005 23 Replies

This ought to be a "no brainer", but since I never saw any data from the oe cat, I'm not sure where to go from here. My customer told me the installer told her he didn't think it was the cat due to its' ( good ? ) condition, but he replaced it anyway with the ...

23 Replies Received (View Replies)

  Related Documents & Media  1999 Chevrolet Blazer

 
Message Closed w/FIX

car Vehicle Data

1999 Chevrolet Blazer

VIN 1GNDT13W0X
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, P0420
Misc.Calibration # 09374012

Trouble Codes

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

car Vehicle Data

1999 Chevrolet Blazer

VIN 1GNDT13W0X
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, P0420
Misc.Calibration # 09374012

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)