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Ware po138 sensor located

Where is the sensor po138 located

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I have a 2010 dodge grand caravan.replaced both 02 sensors and cat.now i have a code po138 and po404.what does that mean.


P0138 - Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. The only way to set this code is to have a break in the sensor's ground wire or the signal voltage wire is shorted to the 12 volt heater wire for that sensor. Start by looking for a corroded terminal in the sensor's connector or a terminal that got stretched or pushed out of the plug body. Next, check the wiring harness for signs of melted wires, especially where they travel near hot exhaust parts.

If you haven't found the cause by this time, use a scanner to view live data and look at the sensor's voltage compared to the passenger side sensor. If it's normal, you have an intermittent problem that isn't currently acting up. Try flexing on the wire harness to see if the voltage changes. If the voltage IS high, unplug connectors going to that sensor and wiggle harnesses until the voltage changes. That will help you narrow down the location of the problem.

Oct 17, 2016 | Dodge Grand Caravan Cars & Trucks

1 Answer

PO138


P0138 -02 sensor bank 1 sensor 2 voltage high

Bank 1 is where cylinder number 1 is located, being sensor 2 this is the downstream sensor or the catalytic monitor sensor. Voltage high means the sensor signal or the return signal are shorted to ground.or the 02 sensor is disconnected, check the mating connection or the harness for proper mating , and harness being shorted.

Aug 17, 2014 | Chrysler Town & Country Cars & Trucks

1 Answer

How engine performance is affected by bad o2 sensor po138


Hey, The o2 sensor affects the fine tuning of the engine. it is used to tell how well the engine is burning off the fuel in the combustion process. if there is too much oxygen, then it will adjust the air/fuel mixture accordingly and vice versa. If the car runs too lean or to rich you will loose power and possibly damage your engine. It would be a good idea to replace if its faulty.

12_29_2012_11_58_16_pm.jpg

Dec 29, 2012 | 1997 Cadillac DeVille

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Po138


it is a bad o2 sensor,and it is located as upstream and in the back exhaust manifold by the fire wall

Dec 29, 2012 | 1997 Cadillac DeVille

1 Answer

Po138 sensor 1997 olds aurora where is it


I would be inclined to say it is electrical in nature. Did you set the spark plug gap at .050? It is possible you could have a bad plug wire. Where did you get the DTCs from? GM service shop? #7 cylinder is on the rear head. Check wiring again just to eliminate that possibility. As a last ditch effort, get the GM shop to DIAGNOSE your problems, and then fix it yourself. Again, I think the source is electrical, but it is possible, although unlikely you could have a fuel problem, but no fuel DTCs are showing. I assume the MIL on the dash is lit.

PARTS OF BMW.

May 30, 2012 | 1997 Oldsmobile Aurora

1 Answer

KEEP GETTING CODE PO138


O2 Sensor Circuit High Voltage Bank 1 Sensor 2
This is the sensor located after the catalytic converter.

Oct 28, 2009 | 2007 Suzuki SX4

1 Answer

2000 dodge truck code po203 po204


p0203 injecter circuit malfunction cyl #3. p0204 injector circuit malfunction cyl#4. po138 02 sensor circuit,high voltage cylinder bank no.1,sensor no.2

Jul 08, 2009 | 2000 Dodge Ram 1500 Truck

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