Question about 2005 Hyundai Elantra

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My 2005 Hyundia Elantra is showing engine code P2251. What is that?

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P2251 L.O2 reference circuit(-) open-Sensor 1. This code is showing a problem on the reference voltage of the upper O2 sensor. It might be sensor or the wiring. P0304 Cyl.number 4 Misfire detected. This code is showing 4th.cylinder is or has been missing. Second code might be set by first code.O2 sensor problem needs to be corrected first.

Posted on Sep 09, 2010

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CODE DTC P2251 - HO2S 11 SENSOR REFERENCE GROUND CIRCUIT OPEN BANK 1 SENSOR 1**** POSSIBLE CAUSE POOR CONNECTION OR DAMAGED HARNESS OR THE HO2S SENSOR HAS FAILED.

Posted on Sep 09, 2010

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2004 hyundai elantra sedan check engine light on, 1st try at autozone gave P2251 followed by P0420, I reset the car computer to check if it comes back and it did after nearly 100 miles. second try at...


The codes that i have pulled out relates to Oxygen sensor and Catalyst converter faults.
P0420: Catalytic converter system,Bank 1,efficiency
below threshold.
P2251: Heated Oxygen Sensor (H02S)1, Bank 1, negative current control open circuit.
But not necessary the faults. You need to run the scope to see wht patterns u get on the oxygen sensor, and on the obd scanner you may be able to pick up oxygen sensor coming on and going off or rich or lean mixture and the mvolts of the sensor. Also check if the wires are not broken on the sensor. Sometimes a clogged O2 sensor can cause these problems.

Aug 13, 2014 | 2004 Hyundai Elantra

1 Answer

Engine light on in 09 hyundia elantra after changing 02 sensor


That is because the check light indicated on OBD2
System Fault

You replaced a part based on the code

The codes are used to diagnose the system that set
the code & then component test

You apparently didn't diagnose the real cause of the
possible problem

The sensor may have been just doing it's job

When you come here either give use the codes or
just Google them to learn the ins & outs

Dec 08, 2012 | 2009 Hyundai Elantra

1 Answer

How to change the p2251 o2 sensor on 2005 hyundai elentra


I've supplied a generic tutorial on how to replace an oxygen sensor. It should take you from 15-30 minutes even less if there is little or no rust.

May 30, 2012 | 2005 Hyundai Elantra

1 Answer

I have a Mazda3 2007 and it has a check engine code of p2251, can you help? Car also hesitates


The P2251 error code means you will need to replace the front O2 sensor (the oxygen sensor that bolts into the exhaust manifold accessible under the hood)

Jan 27, 2011 | 2007 Mazda 3

1 Answer

Hi i have a 99 hyundia elantra my check engine light is on the codes are p1624,p0137,p0732and p0740 are these codes connected or different problems


As for p1624 this code is for the accent only.
p1613 means the same thing but for the elantra, the
code means malfunction indicator light(mil) signal
circuit input high volt. p0137 means ho2sensor high
voltage (fuel pressure out of range high) p0732 is a
transmission code. It means that due to a malfunction in the trans. circuit, the trans. will operate in limp mode meaning you have reverse and
one forward gear in this case 2nd gear. That brings
us to p0740 this code indicates a malfunction with
the damper clutch control solenoid at the trans. this
would cause the p0732 limp mode. But if your car
is not showing any of these problems, the cause may
be the engine control module or the transmission
control module. But this would have to be checked
with the proper test scanner. Hope this helps.

Feb 19, 2010 | Hyundai Motor 1999 Elantra

1 Answer

What kind of anti-freeze goes into a 2001 Hyundia Elantra and a Hyundia 2005 Santa fe


i trust you are talking about the radiator(ive had people refering to their a/c system recharge as installing the anti freeze). this takes a standard good quality anti freeze/coolant mixed with distilled water.

Jan 07, 2010 | 2001 Hyundai Elantra

1 Answer

2002 Hyundia Elantra Service engine soon light.


When the check engine light flashes, It's not giving out codes. It is telling you that the engine is misfiring on 1 or more cylinders. New plugs and wires might fix your problem.

Apr 12, 2009 | Hyundai Motor 2002 Elantra

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