Troubleshoot a P2122, P2123, P2127 or P2128 ODBII code | No oscilloscope | VW Wiring

[@blauer_Stuhl]

On the very last test you did, were you connected pin no. 2 and no. 4 i get a p2123 and a p2128. What should I do? Thank you in advance

[@heathputnam9524]

Could be several things… from easiest to very bad. Accelerator pedal assembly, throttle position sensor, bad wiring or connector, engine control module. Are the O2 sensor wires under the car in good condition? If they are disconnected or damaged fix them first. That can cause the ECM to burn out. Watch the video again and do the checks as specified. Good luck!

[@krislauver5267]

Thank you so much, this is what my car just started to do . And I am really sure you have saved me a lot of money and time. Awesome 👍😎😎😎

[@W0WHERMY]

Great video! I have mercedes and p2123. Only get limp mode when. I press full throttle. There is a full throttle switch in my pedal and i am thinking the pedal needs replacing. I am just trying to think, how to confirm so i don't replace my throttle and its something else like you had. This video gave me a few ideas. If you have suggestions, let me know. Thank you!

[@m3rg1mH]

Thanks, great video, i have the same issue, all my wires seems OK after test, would next step be to check resitors in ECU?

[@frankierodriguez5620]

Hi & thank you. Did you say with the key turn 'on' or 'off' when testing?

[@heathputnam9524]

On

[@GERRYJADE1]

Hi there, when I test Pin 2 and 3, I only get 3.2V. The 3 previous test all had 4.96V. Where should I go from here?

[@mdorgham]

That was really helpful. Thanks for your time and effort. Why not just check the voltage between pin 1 and pin 5 directly by multimeter?

[@heathputnam9524]

Yes, you are right. You could check the voltage but I was not sure if it was a bad wire or ECU so I was using the high (5volts) to tigger the ECU code as well as check the wire. I’m no pro I just shared how I did it ;) Thanks for watching!

[@CraigGallagher-t2m]

Only getting power on pin 1 and 2 what does this mean ?

[@richardstokes755]

Excellent video thank you

[@chessmaster3225]

my OBD2 scanner cant read my 2012 VW jetta se, any comments Heath, Im desperate

[@Habbasio]

thanks GODBLESS YOU VERY GOOD LOVE I HAVE SOME CODE TOMORROW I WILL CHECK AS YOU SHOWAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

[@heathputnam9524]

Thanks for watching!