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I have a 2000 Hyundai Elantra and the check engine light

Sent to Car Experts October 25, 2005 7:55 p.m.

I have a 2000 Hyundai Elantra and the check engine light code, P0422, Main catalyst efficiency below threshold is on. Also, the car is getting terrible gas mileage (24 mpg highway) and from time to time when stopped the idle fluctuates between 1500-2000 RPM. Not sure if these are all related, but could there be a possible related problem? Thanks.

Optional Information: 2000 Hyundai Elantra 2.0 L

Customer (name blocked for privacy)

Status: Closed Value: $10

Info Request
October 25, 2005 8:11 p.m. (16 minutes and 28 seconds later)

P0442 is a straight forward code. As long as there is not any oxygen sesnsor code in the computor, replace the convertor. But before that is done, get the idle fixed. The idle fluctuates, the injector pulse width is not right witch then floods the convertor, or starves the convertor of gas causing it to run hot and shorting the life span. sounds like there is a air leak on the vehicale. Does it have a mass air flow sensor.

AMEDEE -- ASE MASTER TECH -- 98% Positive Feedback on 1038 Car Accepts
ADVANCED LEVEL SPECIALIST

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