Question about Hyundai Elantra

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Check engine light came on my wife's 2006 Hyundai alantra 2.0L, had 2 people scan codes and both read o2 sensors.

Replaced both sensors and cleared code,light came back on after one day with a code reader error display , any ideas ?

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  • Hyundai Master
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First,new parts don't mean they work.
Try a different code reader to pull the codes.

Posted on May 08, 2017

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Where is the 02 Oxygen Sensor before the cadalic converter on a 2006 Hyundai Santa Fe


Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

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I guess I should start by saying that trouble codes do not instruct the mechanic to replace a component. Only to check it.
Code 31 is for a problem with the heater circuit for that O2 sensor. The sensor is not warming up fast enough to satisfy the engine computer. Since you have replaced the sensor, the actual problem could be in the wiring or the source of power for the heater built into the sensor.

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Good afternoon..... I've been on here before My question is this.....I have a 2006 nissan altima 2.5s and the check engine light us on .....I replaced the O2 sensor by the cat. And u cleared the code and...


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I have my engine light on, in my xg300 Hyundai 2001 if i replace the mass air flow sensor and my fuel air metering my light go off, Im a woman trying too fix my car my self pls help tks code...


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in my opinion any miss will cause o2 sensors to read lean because the cyl is in effect a air pump sensors only pick up o2 not the fuel does you engine run rough or hesitate/shaking on acceleration
i would check coil wire and plug for #6 also the injector not working will cause miss also they look ok do compression test on cyl will read 150psi if you find cause of miss you will be able to diagnose lean

with the tps sensor check to see if the connector was disconnected at any time you were testing

basically you need to isolate misfire and fix then have the computer cleared of codes drive car and if engine light comes on then we will go through test procedures for new codes

i hope this helps you to get a few ideals on how to proceed good luck ley me know

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The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.

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