Question about 1997 Jeep Grand Cherokee

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The code is po138 what is it

The code is po138 what does the code mean

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Bad O2 sensor

Posted on Jun 01, 2010

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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

What does toyota codes PO037 and PO136 mean?


P0037 is "Heater Control Circuit Low Bank 1 Sensor 2".
P0138 is "Oxygen Sensor High Voltage".

It sounds like it's time to check the connector to your oxygen sensor, and probably replace it (the O2 sensor).

Jul 26, 2014 | 2003 Toyota Tacoma

1 Answer

98 codes po138


Code 138 is O2 sensor 1/2 circuit high voltage. This means the sensor after the catalytic converter on the side with cylinder one is staying in the rich range. The sensor could have failed or it could be a fuel problem in the engine.

Feb 23, 2014 | 1998 Dodge Durango

1 Answer

Mercedes faults


air fuel ratio sensor ,the back one is not reading correctly.have a scan check & read the sensor.most likely is the sensor .bank one ,the back (rear)one

Jan 27, 2014 | 2001 Mercedes-Benz ML 320

1 Answer

Service engine light


do you have two o2 sensors after catalytic con.could be not good.

Mar 07, 2013 | Cars & Trucks

2 Answers

OBD system diagnostic trouble codes? what do they mean? P0123 P0138 P0205 P0305 P0300


po123-tps curcuit high---po138-02 sensor high volts bank 1 sensor 2,--po205--injector curcuit open cylinder 5,---po305-- misfire cylinder 5,--po300 random/multible mis fire,

Jun 02, 2010 | 1998 Dodge Caravan

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

1 Answer

Failed smog check


po304 is just that #4 cyl has a problem could be a bad spark plug or a bad plug wire or bolth
if it hasnt had an ign tuneup its time.
the po138 is just telling you one of the cylinders isnt burning all the fuel put into that cyl.
so its just cause and effect.
if ya need any more info let me know
later paul

Oct 01, 2008 | 2000 Chevrolet Express Cargo

1 Answer

Didn't pass smog


did it fail high hc? you could change 4and 6 coils around and see if you get a p0306 that means the coil pack is bad. common on this type.

Oct 01, 2008 | 2000 Chevrolet 2500

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