Question about 1997 Cadillac DeVille

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Po138 what does this code indicate in my car

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

Posted on Dec 29, 2012

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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

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2002 mercury villager code po325 code po138 code po139


P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor) -Circuit Malfunction
think you just need a new o2 sensor

Nov 03, 2013 | Cars & Trucks

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Code po138


code P0138 is :O2 sensor circuit high voltage (Bank 1 Sensor 2).The bank 1 is where the number 1 cylinder is exhaust.sensor 2 is the one after converter catalyst , it control the catalyst converter is doing is job

Sep 14, 2013 | Chevrolet Cars & Trucks

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96 Ram 1500, 5.9 litre. code PO138 sensor circuit


it will be the o2 sensor after the cat.. check the connections. the first bank should be the right side of the engine while sitting in the car. look at that side of the exhaust.

Jul 20, 2010 | 1996 Dodge Ram 1500 Club Cab

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I have a error code of P0138 on 2001 maxima


PO138 CODE.REAR HEATED OXYGEN SENSOR MAXIMUM VOLTAGE MONITORING.

Jul 28, 2009 | 2000 Nissan Maxima

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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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