Have 99 dodge dakota 5.2 v8. drivin down rosd engine just died with no warning or prior problems. fuel pump is working got obd2 code p0138 o2 sensor curcuit high voltage bank 1 sensor 2. any ideas?

Dakotas are notorious for this issue, and it doesn't seem to matter what engine they have. They have a tendency to have the crankshaft position sensor intermittently fail. This causes the engine to shut off without warning as though you turned the key off. Sometimes they restart immediately, but they often need anywhere from 15 minutes to a couple of hours to work again. They often do not set a Check Engine Code. The sensor is relatively inexpensive and fairly easy to change. It is a better option that "Easter egging" sensor after sensor, only to have no joy.

very unlikely. Though it is possible that the engine is burning more fuel than the o2 sensors can measure. This could be caused by a number of things that affect fuel management. Use these codes as a reference to identify the problem.

Don't know what to do? Explain that

You don't go to a repair shop ?

If you work on your own vehicles,
you would google the codes & learn
what they tell you

That said, you still won't be able to
diagnose & component test

Don't throw parts at it

sorry this is kind of confusing,. sounds like you had problems that went without repair,

What exaclty is the problem NOW?
You could need to replace the upstream or downstrem o2 sensor, have a short at the fuel pump or along the way = inspect all wiring, especially at the fuel tank (where your fuel pump is located).

after more thoughts:

P0138 has high voltage at the o2 sensor, check relays and inspect all wiring leading to it.

p1282 is excessive injection control pressure - maybe some regulaator in the fuel line which is failing?
I hoipe this helps, if not please separate the issues, in some historical order with paragraph separation (sorry I am a little dislexic and it is hard for me to follow -- and hopefully someone can assist further?
Best regards
Ck

P0138 DODGE - O2 sensor 1/2 Circuit highhttp://engine-codes.com/p0138_dodge.htmlForum CodePossible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks Tech notes Replacing the rear O2 Sensor bank 1 usually takes care of the problem.

P0038 typically indicates O2 sensor failure or possible grounding out if the cabling to it has failed. Start with that as it is easier to replace than all the plugs/coils etc. Reset the code and cross your fingers.

P0138 is code for o2 sensor Bank 1 Sensor 2. This sensor is the one behind the cat on the side of the engine that contains cylinder No 1.

Could be just the sensor, could be a bad fuse, or could be bad wiring. Change the sensor, check the fuse, and check wiring, or reverse order.

dont know lots about this witout engine size but some have 1 coil per cylender possible coil is bad or plug 02 sensor will cause some problems but a miss fire will cause it to run like trash