× 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
1998 Mazda Protege DX 1.5L MIL Lamp on, CODE 421
Posted to Asian Driveability on 8/1/2002 15 Replies

hi group

i have this mazda that is repeating code 0421 (catalystic efficiency). the problem i have is that mitchell does not list code 0421. i have information on code 0420. my question is, are codes 0420 and 0421 the same? if so i can use the flow sheet for ...

15 Replies Received (View Replies)

  Related Documents & Media  1998 Mazda Protege DX

 
Message Closed w/Summary

car Vehicle Data

1998 Mazda Protege DX

VIN JM1BC1417W
Engine1.5 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Code 421

Trouble Codes

P0421Catalytic Converter Efficiency (Bank 1)
Message Closed w/Summary

car Vehicle Data

1998 Mazda Protege DX

VIN JM1BC1417W
Engine1.5 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Code 421

Trouble Codes

P0421Catalytic Converter Efficiency (Bank 1)