Po775 trouble code

Question edited for clarity.
Question moved to sub category.

The P2159 diagnostic trouble code is most commonly fixed by replacing the vehicle speed sensor. Keep in mind that ABS components, other trouble codes, and aftermarket tires may be responsible for this code being stored by the PCM. Take time and complete a thorough diagnosis before replacing the vehicle speed sensor.

P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range ...

Videos as well

https://www.google.com/search?q=2014+Hyundai+Elantra.+How+to+fix+P2159

..

When a warning light is on, a trouble code is stored in the computer. You must get the trouble codes read and fix the underlying problem. Then the light will go out by itself. No fix= light on full time

The 31 code should be air flow meter or its circuit . I would check it first as that will cause idling issues .

http://www.obd-codes.com/p0440

do the easiest cause first... did you recently get gasoline and didn't put the fuel cap back on correctly?

CLEAR the trouble code and re-seat the gas cap properly & then see if the check engine lights up with the same code... then go from there

i've embedded gbob59s link because it should have worked the first time

http://www.explorerforum.com/forums/showthread.php?t=228242

This shows list of codes. You have so many faults hard to know where to start. Was new engine an EXACT match for the old one? If not, did you change ECM? Appears MAF is not connected or bad, and also #1 injector circuit is bad. Others also.

As with all warning lights, the first step is to get the trouble codes read. With over 800 possible trouble codes, it's impossible for anyone to guess what codes are stored in your car's computer. http://ricksfreeautorepairadvice.com/fix-check-engine-light-on

Anytime you get OBD Codes-- you Google them
& the solution

OBD PO775 & your vehicle

PO 775 That is a Factory Code
You can Google it
There is enough to keep you busy a long
time if you can figure it out

Appears to be a Trans Solenoid issue
I don't know if they are individual or a entire
pack like my Lincoln LS

When you figure it out you can do yourself
Not all that hard


P2195 Lack of HO2S11 Switch,Sensor Indicates Lean

That should be your front oxygen sensor on the pass side

I would replace both upstream sensors-- if you failed to do
so at 100,000 miles,on all your vehicles,then you avoid at
least some problems

P0775 - Pressure Control Solenoid B Malfunction

The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). The P0775 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Possible Causes:
- Faulty line pressure solenoid B valve
- Line pressure solenoid B valve harness or connectors
- Line pressure solenoid B valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

That code is the shift solenoid B in the tranny. Have to take it to get it fixed.