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Code PO133 Keeps Coming Up - Elantra Hyundai Cars & Trucks

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I really hate to state the obvious, but if the code "keeps" coming up it is because the code keeps not getting properly diagnosed and repaired.

The generic description for code P0133 is "Oxygen Sensor Slow Response Bank 1 Sensor 1"
This could be due to an oxygen sensor that is just plain worn out and chemically inactive. However, The most likely cause is contamination of the oxygen sensor. (especially if the sensor has been replaced and the code still returns) Contamination from oil or antifreeze is the most common cause of this code. Oil gets into the exhaust due to bad valve seals or piston rings. Antifreeze gets into the exhaust due to blown head gaskets or cracked heads. It can also be contamination from misuse of RTV sealants or aftermarket fuel additives. In any case, replacement of the sensor alone will most likely only result in a repeat repair. The source of contamination must be identified and corrected for the repair to be successful.

Posted on Apr 02, 2011

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Bad oxygen sensor bank 1 sensor 1 which is the sensor on the drivers side of engine and closest to the front of the car.

Posted on Apr 02, 2011

It doesn't keep coming up

Your ignoring the reason the light is on & doing nothing

PO 133 O2 Sensor Circuit Slow Response
(Bank 1 Sensor 1)

You need a repair shop

Posted on Apr 02, 2011

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P0133 us a oxygen sensor that is responding slowly-'lazy', not switching fast enough for the engine computer's liking.
this is common for a sensor that is close to or over 100,000 miles, and they are pretty easy to replace. cost is usually somewhere from $50 to $80 (ballpark) and you will be glad you replaced it as it usually helps gas mileage and it will feel more responsive.

Posted on Apr 02, 2011

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