× 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
2003 Toyota Corolla LE 1.8L MIL Lamp on
Posted to Asian Driveability on 11/9/2009 13 Replies

We replaced cat convertor and rear O2 sensor for a code PO420 code returns within 2 days,we sent to dealer for reprogram but were told we need to replace the pcm for this car to fix.I can not understand how after 137000 plus miles without a code po420 that pcm...

13 Replies Received (View Replies)

  Related Documents & Media  2003 Toyota Corolla LE

 
Message Closed w/FIX

car Vehicle Data

2003 Toyota Corolla LE

VIN 2T1BR32E93
Engine1.8 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

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

car Vehicle Data

2003 Toyota Corolla LE

VIN 2T1BR32E93
Engine1.8 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)