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Old 03-30-2009, 08:19 PM   #1
intimidator3rac
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Dizzy Code P0138on a 99 SL2

Hi, can someone give me what this code meens P0138 = O2 sensor Circuit Hight voltage (Bank 1 Sensor2), do I have to change the O2 sensor or it's something else, and if so do I have to put a original replacement or a good jobber would do the job. Help please.

Best regards,

Al

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Old 03-30-2009, 08:50 PM   #2
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1998 SC2
Default Re: Code P0138on a 99 SL2

Depending on the mileage of your car it can be a defective rear heated O2 sensor or sensor circuit. If its the O2 sensor then a universal sensor will work as a replacement.

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Old 03-31-2009, 05:15 AM   #3
intimidator3rac
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Default Re: Code P0138on a 99 SL2

The car has 125K on it, thanks for the answer.

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Old 03-31-2009, 07:47 AM   #4
paulo
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Default Re: Code P0138on a 99 SL2

I had the same problem and purchased a universal 4 wire oxygen sensor for $37 that fixed the problem. A direct fit oxygen sensor from the dealer would have cost $160.00. There are two things that can go wrong with the oxygen sensor itself. The heater on these sensors can develope an open circuit (burn out) This sensor is after the catalytic converter and operates at 600 degrees farenheight and it is the furthiest from the motors heat, hence the need for a heater circuit. The second thing is a deterioration of the output signal from the oxygen sensor itself. We are talking about a very small current of one millivolt. Deterioration will effect either the response time and/or the signal strength. Before replacing the oxygen sensor I would rule out a problem with the connector that goes to the oxygen sensor itself. You should have one pin showing 12volts / two pins showing a good ground. The last pin is the sensors signal to the PCM. The upstream single wire oxygen sensor should be a direct fit, since it helps control the air/fuel ratio, hence gas milage. Trying to save money here may cost you more money in the long run.

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