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Discussion Starter #1
Finally got around to going to Auto Zone and have them check the Check Engine Light that I posted several weeks ago.

The scanner showed a code of P1153. In their print-out, it talks about several problems of which I don't have a clue.
1.Failed HO2S-21 heater circuit.
2.HO2S-21 signal shorted the ECM ground.
3.Improper oxygen supply to sensor- Check sensor connector and wire.

Are we talking about a bad oxygen sensor or something else. I am totally lost as to what HO22S-231 is.

What do ya think?
 

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Sounds like you need to replace drivers side front sensor


HO2S (Hot Oxygen) sensors develop a voltage by comparing oxygen in the atmosphere to the level of oxygen in the exhaust gas. Rather like a battery, the sensor produces a voltage between 0.1 volt and 0.9 volt depending on the amount of Hot Oxygen to which it is exposed in the exhaust stream. In Lean conditions (High in Oxygen, low fuel level) the sensor returns a low voltage because there is less differential between the oxygen in atmosphere, while in Rich conditions, (Low Oxygen, high fuel) it reads high because there is a large differential between the level of oxygen in the exhaust stream and atmosphere. The change between the two readings occurs suddenly in what is known as a 'switch', but this term does not have any electrical connotation. This effect is illustrated in the figure below:

 

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NOTE: In the event that the ceramic element on the HO2S sensor is cracked, raw fuel can contaminate the air reference side of the HO2S. Since the exhaust gas now contains more oxygen than the reference side of the sensor, the HO2S will return a negative value. This effect is called the Characteristic Shift Down, and where it is observed the affected sensor will have to be replaced.
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The HO2S Sensor

 

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OK, Mr. Dr. Professor Jamie, he only asked if it was referring to the O2 sensor. He didn't need a class...:lol:

j/k

Good find


ps: that's a reference to Sponge Bob, where Patrick insists on being called "Mr. Dr. Professor Patrick"

Yep, I watch too many cartoons with my son...lol
 

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I don't mind the lesson, it's the quiz on friday that kills me.

Learned something new today. Thx!:great:
 

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Glad I could assist in your knowledge base. Usually its the other way around. I usually pick something up from you...:lol:
 

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Discussion Starter #7
Thanks for the VERY technical info guys. I guess the bottom line is to replace a O2 sensor?
 
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