Question about Hyundai Motor 2003 Elantra

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P0139 code for a 2003 hyundai elantra. What is this code?

P0139 code for a 2003 hyundai elantra. What is this code and how can i replace it myself?

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Anonymous

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Hi the code P0139 is Bank 1 sensor 2 lambda sensor fault ,possible wiring or sensor fault even if you replace the sensor you need to have the MIL lamp turned off by a Diagnostic machine,it is possible you have another fault such as poor Catalytic converter efficency giving the same fault code ,Would recomend you get the car checked and read the "live" data as the car see`s it to make an accurate diagnosis and cure

Posted on Jul 10, 2009

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Paul McGrath

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P0139 HO2S Circuit Slow Response (Bank 1 / Sensor 2). This is the downstream sensor (after the catalytic converter). Odds are the sensor is going bad. Check connections/ connector to this sensor. If you don't find any problem/trouble with this connector, replace the O2 sensor.

Posted on Jul 18, 2009

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I recieved a code PO139 on my Hyundai Elantra and was wondering what that code details. Thanks


P0139 - HO2S Circuit Slow Response (Bank 1 / Sensor 2)

Possible causes:

Leak in intake or exhaust system
?? Faulty fuel system.
?? Front and rear HO2S connections reversed.
?? Contact resistance in connectors
?? HO2S contamination

Most PROBABLE cause: Defective/Old/Aging O2 sensor

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Did you use a aftermarket O2 sensor or a genuine Hyundai one? If it's an aftermarket one it may be bad or not as good as the OEM one. See here for more details and other potential causes: P0133

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1 Answer

My car indicates check engine sigh with following two codes 1: p0139 2: p0140


Hi Garcha,

Both codes relate to O2 Sensor # 2

Code P0139: O2 Sensor Circuit Slow Response - Bank 1, Sensor 2
Code P0140: O2 Sensor Circuit No Activity Detected - Bank 1, Sensor 2

A faulty O2 sensor will mean incorrect signals will be sent to the EFI computer, causing erratic engine running.


Cheers,


"If this has helped you in any way, please rate this solution" :-)



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