Question about Hyundai Motor 2004 Sonata

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2004 Hyundai sonata eng code PL121, a throttle position sensor, but the throttle position sensor tests out good. What else could it be?

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  • Hyundai Master
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Code 121 is for a problem with the circuit for the sensor.
The computer is getting a signal that is out of range, too low or too high.
If you know for a fact the sensor is ok, you may have to check the circuit back to the computer. You would also need a scanner to read the sensor signal.

Posted on Jan 18, 2013

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Posted on Jan 02, 2017

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ghost45
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SOURCE: I have a 2000 hyundai Sonata, 6 cylinder eng. My

The sensor is located on the left hand rear side of the block (near the bell housing). It is held in place by a 10mm bolt. It's to the right of the exhaust manifold (LH - radiator side) on the V6. Once you purchase the new sensor you'll be able to identify it on the engine. The connector to this sensor is located in the illustration.
2cb09a4.jpg A word to the wise... replace the O2 snsr as well.

Posted on Oct 04, 2009

  • 1 Answer

SOURCE: diagram 2004 hyundai sonata crankshaft sensor A

U uvicasion del crank shaft position sensor

Posted on Dec 07, 2011

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Diagram 2004 hyundai sonata crankshaft sensor A


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The sensor is located on the left hand rear side of the block (near the bell housing). It is held in place by a 10mm bolt. It's to the right of the exhaust manifold (LH - radiator side) on the V6. Once you purchase the new sensor you'll be able to identify it on the engine. The connector to this sensor is located in the illustration.
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