Sonata GLS Problem

My 2000 Sonata GLS V6 (36,000 miles) showed a problem when I started
it today. At idle the engine sounds as if it is misfiring or it is
running very rich. The engine idles with a vibration. The Check
Engine Light is on. This is a week end so I have not yet taken it to
the dealer for a diagnostic.

Are the symptoms I described typical for a failed oxygen sensor????

Old_Timer (Who misses the old DIY days)

 

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Could be -- a failed O2 sensor will cause the computer to make
adjustments in the engine parameters. However, it sounds more like a
plugged catalytic converter -- although that would be surprising at such
a low mileage. Any chance that leaded fuel was put in at any time
previously?

Good luck,
Harry

 

Could be the oxygen sensor, or it could be a bad spark plug. Mine had the
platinum ones, but one did not last the length it was supposed to. Thank you
Hyundai warranty. Also, had a spark plug wire go out too.

Steve

 

I would suspect plug wire first. that's the only thing that I have had
problems with on my 99. Take it to Auto zone and let them read out the code
for you free. If its a 301-306, its a plug or plug wire(most likely)
bill

 

Take it to the dealer and take advantage of that
warranty!!!

ElantraStan
http://www.stanarseneaux.com/elantra/

 

Agreed. You are still covered under the warranty period so take it to
the dealer and have them handle it. It is most likely either the spark
plug wires or a bad spark plug (happened to my sister's 99 Elantra at
55k). Try clearing out the ECU by pulling the battery for a few
minutes. If it is a bad O2 sensor, the check engine light would come
on after a few minutes and not when the car starts up.

Nick

 

No. Don't clear the code. This helps provide information to whomever
diagnoses the car. And, if it's the O2 sensor, the lamp may not come on
again for days.

 

I took the car to the dealer this Monday morning. I told the service
manager that my guess (from my DIY days) was a bad plug wire. It
was the #2 plug wire and the dealer replaced the set of ignition
wires. I found out that there was a recall for oxygen sensors and two
were replaced and the ECU reprogrammed.
The dealer also found a code for the Trans Range Switch and replaced
that item as well.

All covered under warranty.

Old_Timer

 

I'm not that knowledgeable about what cost Hyundai charges to check
and reset the ECU however on Honda's it is always a good idea to reset
the ECU in case there is any false error because you'll end up paying
the bill if it was a simple reset. If there is a problem, the light
will come back again.

Nick

 

Good news to know...it looks like you are fixing the same parts that I
had to fix on my sister's Elantra. Could be a supplier defect?

Nick