Howdy everyone, I got my 2011 Hyundai Sonata, with 230,000 miles, Inline 4 GDI, 6-speed automatic transmission. Anyways, the check engine light came on the other day, and I went to get it checked out, and it said that an Oxygen Sensor is failing, or has failed. I do not know the code because the mechanic forgot to tell me the code. Anyways, the other day I was driving, and all of a sudden my tachometer hit 0, but it was still running. When that happened, my traction control light also came on. It drives just fine when the tachometer hit 0, but when I stop, it runs really rough, and feels like it wants to die. Could this be caused by the failing Oxygen sensor? Or is it another problem that arose? Also it never did that tachometer and traction control light situation before.
If yall want a video on it, I will post it soon
Video is here: https://www.youtube.com/watch?v=xnOG-JQKkbU
Maybe replace the CKP (Crankshaft Position Sensor)
Then why is my Traction Control Light on? That never happened before, and it goes away after I restart my car
Probably because the ECU doesn't know the engine RPMs and that's one of the sensor inputs it uses to operate the traction control.
It goes away when you restart because the computer doesn't "hold a grudge" from one drive cycle to the next.
Why does it run rough when I stop, but doesn't run rough when I go to accelerate?
I understand why this is perplexing. If the Crankshaft Position Sensor (CKPs) is bad you'd expect the car wouldn't run.
The thing is with those Hyundais you can take a perfectly running one, unplug the CKPs and the car will stall.
But then, CKPs still unplugged, you can crank the engine (it may take a little longer than normal) but the thing will start.
It will idle poorly, the tachometer will display "0", and it will want to die. (just like yours)
But once you accelerate it will drive.
The Camshaft Position Sensor will provide the ECU with signals to enable ignition and injector timing.
It's a $25 part. (Just "throwing the idea "out there" for your consideration)
Oh ok, I thought it was a timing chain or belt problem, I will try that soon. Thanks!
Hey! I forgot to post an update. But it turned out it WAS in fact the sneaky CPS (crankshaft Position Sensor) was the culprit.
Thanks for reporting back.
@jack62 just wanted alert you to this update regarding your ‘solve’ in case you didn’t see.