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2002 Hyundai Elantra GLS 2.0L Excessive Emissions, Poor Fuel Economy
Posted to Asian Driveability on 6/20/2012 4 Replies

This vehicle is giving a reading on o2 sensors when the engine is off (not running) we have trried a good known computer and the problem is still the same. Both o2 sensors are reading the same 420 and 424 . I did read another post who had the similar problems ...

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  Related Documents & Media  2002 Hyundai Elantra GLS

 
Message Closed w/FIX

car Vehicle Data

2002 Hyundai Elantra GLS

VIN KMHDN45D12
Engine2.0 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Fuel Economy
OccursAlways
Misc.P0420

Trouble Codes

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

car Vehicle Data

2002 Hyundai Elantra GLS

VIN KMHDN45D12
Engine2.0 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Fuel Economy
OccursAlways
Misc.P0420

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)