Question about 1996 Chevrolet Tahoe

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Po138 where do i start testing for the problem and how

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Bank 1, sensor 2. Confirm which bank is 1 on your engine, and it will be the one after the catalytic converter. Normally replacement fixes problem, but try pulling electrical connector to it, apart & cleaning well then retry, just in case only bad connection. Part store should be able to confirm which bank is 1 on your engine.

Posted on Oct 06, 2009


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Hi im getting codes PO107/Po138 and Po139 on s40 volvo 2002 2.0t sport petrol is it best to change the map sensor first and see if that clears the other problems .

no dear, bcos P0107, EGR/Barometric Signal circuit is less than self-test minimum. ... P0138, Downstr Heated Oxygen Sensor circuit Voltage High - Bank No. ... P0180, Engine Fuel Temperature Sensor circuit - Electrical fault. .

Jun 15, 2016 | 2002 Volvo S40

1 Answer

What is the meaning code p 0138?

PO138--Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Next time Type: OBD PO 138 & read up

That is how you find codes

Now before you throw parts at the unknown, google &
study obd 2 systems & oxygen sensors

You will be very suprised how much there is to learn
about cars

Codes have to be diagnosed & parts component tested
BEFORE any parts get replaced

Have to find a problem first & have to test to find a failed
part,or why would you change one

The idea is to study & learn things,not take the short way out,
in hope of a quick fix,it will work a couple times with codes,
then your back here or at a shop

Jun 11, 2014 | Jeep Grand Cherokee 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.


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.


May 30, 2012 | 1997 Oldsmobile Aurora

1 Answer

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.

If you need further help, reach me via phone at

Jul 20, 2010 | 1996 Dodge Ram 1500 Club Cab

1 Answer

Po138 code on 96 chevy tahoe 5.7l where do i start testing

P0138 is a code for an unexpected high voltage in the post cat o2 sensor on the left side (bank 1 sensor 2). It often is a result of an internal short between the oxygen sensor heater and the actual oxygen sensor. I would clear the core and if it returns replace the sensor.

Oct 06, 2009 | 1996 Chevrolet Tahoe

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

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