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I have a 06 Hyundai 3.3 thats throwing a PO133 O2 sensor code-we put a brand new GOOD Oem sensor in bank 1 sensor 1, disconnected the battery and bout 3 starts later on with the check engine light so we put it on the computer again and same code- any suggestions?

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Are you absolutely sure that you replaced the correct side sensor. It has two front (upstream) oxygen sensors. Aftermarket intake or exhaust components can cause this code. Poor connection at O2 wires possible. Could be wrong part number sensor.

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

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SOURCE: Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!

It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.

Posted on Jun 17, 2009

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SOURCE: I got 2 codes off the check engine OEM today...

It has two sensors. Bank 1 Sensor 1 is inside the engine bay under the metal heat shield on the front of the engine. Check out NTK sensors online. The one you need will be a 4 wire sensor. The NTK part number is 24588.

Posted on Dec 08, 2010

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Throwing 1 code po133, pending code po171


Nice info but what's your question ? You have a Oxygen Sensor Circuit Slow Response (Bank1, Sensor1) code P0133 , an you have P0171 System Too Lean (Bank 1) ! You have a bad O2 sensor , vacuum leak , Test O2 Sensor mov

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P0133 Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 1 You Could need a new O2 sensor !
A lean-to-rich transition is indicated when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean transition is indicated when the HO2S voltage changes from more than 600 mV to less than 300 mV. A HO2S that responds too slowly is likely to be faulty and should be replaced
This is something that needs to be checked with a scan tool or a volt meter set on millivolts . A scan tool is preferable !
How does the vehicle run ? ruff - smooth , does it have a misfire ?
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It means that the O2 sensor isn't switching as fast as it should. Make sure there are no vacuum or exhaust leaks. Most Likely you got a lazy O2 sensors which would require replacement.

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I have the P0133 code bank 1 sensor 1, i know it could be the O2 sensor but when i disconnect the service hose leading to the evap canister it runs better but only for a little bit. im not sure why that...


CODE PO133 O2 BANK 1 SENSOR 1 SLOW RESPONSE. POSSIBLE CAUSES, LOOK FOR EXHAUST LEAK IN THE EXHAUST MANIFOLD OR EXHAUST PIPES. THE O2 SIGNAL CIRCUIT OR UPSTREAM CIRCUIT HAS FAILED, THE O2 ELEMENT HAS FAILED.COULD BE THE O2 SENSOR ALSO YOU COULD HAVE A VACUUM LEAK OR EXHAUST MANIFOLD LEAK.

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We have replaced the o2 sensor (bank 1/sensor 1) twice, but we are still getting error code PO133. What else could the problem be?


theres a large possibility it may have more to do with your egr valve, or one of its components. these routinely clog up and can cause a o2 sensor code. hope this helps and good luck!

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I got 2 codes off the check engine OEM today... P0171 P2243 I'm thinking O2 sensor, but AutoZone didn't have Hyundai listed. Where can I find Bank 1, Sensor 1? How many O2 sensors does the 06 elantra...


It has two sensors. Bank 1 Sensor 1 is inside the engine bay under the metal heat shield on the front of the engine. Check out NTK sensors online. The one you need will be a 4 wire sensor. The NTK part number is 24588.

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1 Answer

2006 hundai elantra P2270 code. If this is an O2 sensor, which one?


Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

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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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Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!


It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.

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