Question about Hyundai Accent

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1998 hyunda accent check engine light...says warmup cat...what is this and what does it do and were do i find it

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Hi,

I am Sorry to hear regarding the Problem.

check for exhaust leak between oxygen sensor 1 and 2. if no leak.Looks like it points to pre catalyst not doing
its job.You need to replace the Sensor.


P0421 - WARM UP CATALYST LOW EFFICIENCY BANK 1
Catalytic converter efficiency is measured by how well the converter can store and release oxygen needed to convert CO, HC and NOx gases to C02 and water. Under normal operating conditions except heavy acceleration, cold engine temperatures and extended decelerations, the heated oxygen sensor (HO2S) bank 1 sensor 2 voltage should remain relatively steady between 500 mV and 800 mV. This steady reading of the HO2S bank 1 sensor 2 indicates a correctly functioning pre-catalytic converter as the air/fuel ratio changes slightly around 14.7 to 1. If the pre-converter is storing and releasing oxygen correctly. the HO2S bank 1 sensor 2 should hold its voltage value for a certain length of time as the air/fuel ratio increases or decreases. Under relatively steady cruise. the ECM will run a test which records the voltage amplitude values of the HO2S bank 1 sensor 2 as an oscillating air/fuel ratio is introduced. The ECM will then compare the amplitudes it obtained to modeled values of a new-failed catalyst. The closer the actual amplitudes of the HO2S bank 1 sensor 2 are to the modeled new-failed catalyst values. the more inefficient the pre-converter is becoming. DTC P0421 sets when the ECM has determined that the bank 1 pre-catalytic converter is no longer efficient.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on May 30, 2010

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