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2003 Mazda Protege ES 2.0L Misfire, MIL Lamp on
Posted to Asian Driveability on 11/4/2008 10 Replies

had po3oob code , replaced plugs and filters then it has come back with multiple missfire code and cat. efficency below thresshold ..../. what does this mean . is it related to the front or rear o2 sensor , and the multiple missfire code ?? any help appreciate...

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  Related Documents & Media  2003 Mazda Protege ES

 
Message Closed w/Summary

car Vehicle Data

2003 Mazda Protege ES

VIN JM1BJ22583
Engine2.0 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On

Trouble Codes

P0300Multiple Misfire Detected
P0421Catalytic Converter Efficiency (Bank 1)
Message Closed w/Summary

car Vehicle Data

2003 Mazda Protege ES

VIN JM1BJ22583
Engine2.0 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On

Trouble Codes

P0300Multiple Misfire Detected
P0421Catalytic Converter Efficiency (Bank 1)