Question about Hyundai Motor 2004 Sonata

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O2 sensor wiring diagram for 2004 hyundai sonata

Need to identify the variable voltage wire on the O2 sensor bank 1 upper sensor

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  • 2 more comments 
  • Anonymous Mar 19, 2014

    is the bank one sensor one o2 sensor the upper right or left?

  • Anonymous Mar 20, 2014

    bought new wire hareness comes on but no sound

  • Anonymous Mar 25, 2014

    o2 sensor bank one sensor one

  • Anonymous Mar 25, 2014

    bank one sensor one replacement

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  • 625 Answers

There is two wires then suposed to be same color they are not what you looking for but if you have a grey and a black wires it willl be one of those i hope and this help

Posted on Jun 20, 2008

  • Jeffery A Mieldon
    Jeffery A Mieldon Apr 29, 2014

    not much. i have since unplugged all 4 sensors at each pigtail. 10 amp fuse when ign key in switched to on position

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Has any one had problems with bosh oxagen sensor not working properly


Hi there:
Are you buy same or OE part replacement according with the Hyundai part number catalogue? This is important. Keep in midn that you need reset or delete all previous code stored in the car computer.


DTC P0131 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
Essentially the same as P0136 and P0137, a P0131 code refers to the first oxygen sensor on Bank 1. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 1 is located in front of the catalytic converter.


There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.


A code P0131 may mean that one or more of the following has happened:
- Faulty o2 oxygen sensor
- Short to voltage on O2 signal circuit
- High resistance or open on O2 signal circuit


Possible Solutions:
- Replace faulty sensor
- Repair short, open, or high resistance on o2 signal circuit


Now, about DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)


A code P0135 may mean that one or more of the following has happened:
- O2 Heater element resistance is high
- Internal short or open in the heater element
- O2 heater circuit wiring high resistance
- open or short to ground in the wiring harness


Possible Solutions
Repair short or open or high resistance in wiring harness or harness connectors
Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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I have a 04 hyundai elantra it has a code p-2551 o2 bank 1 sensor 1 negative current cricuit/open it did this last yr i got it fixed same code has it went bad that fast or do i need to look for a bad wire...


Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop & owner manuals, service bulletins, campaigns, illustrations and procedures, etc

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Code P0131


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