I have a 2019 TLX and i don't think i noticed this before. but after i took the car back from Oil change from the dealer, i started noticing this pulsating engine reving noise at higher RPM's around 40 mph or higher. My car only has around 33,000 miles on it. It's hard to believe there is something wrong with the engine at this lower mileage. What do you think is wrong ?? or is this normal ? Thank you in advance

 

Which engine?

 

Big one under the hood, with 6 cylinders.

 

Try cleaning the MAF sensor. Make sure to use MAF sensor cleaner.

 

^ this. Also, the experts at the dealer may have checked your air filter (to sell you a new one).
In doing so, they may have dislodged some vacuum tubes or not properly closed the air filter housing. Check everything under the hood to make sure there are no vacuum or other air leaks around sensors.

 

Yes, do this as well. Make sure the lid to the air filter is sealed properly too. The last time the dealership worked on my car they didn't seat the lid properly and it caused a bunch of errors. I even went as far as to scanning it before checking under the engine myself. So yeah...Keep it simple and see if that helps.

 

Yes they did check the air filter and replaced the cabin filter. Also in addition to that problem,, i also got a cracking noise when i turned the steering wheel coming out of the park to reverse. It happened twice so far, now i can't duplicate it. This sounds like something Major is wrong. Also when i first start the car and going up slight incline in the parking garage, engine hulks and jerks,, but then it goes away.... What is wrong with this car ? Car only has 33,000 miles on it. Is this a Lemon ?

Also if they did make a mistake and didn't close the vacuum tubes, can that cause permanent damage to the car ? I am taking it back in next thursday.

 

No permanent damage likely. Try checking yourself under the hood to see if you can spot an obvious issue with the filter housing or other tubing (I am surprise that the check engine light did not come on).
The steering wheel noise is probably not linked to this issue.

 

What do you think could be causing the steering wheel issue ? it was pretty scary,, like cracking noise when i was truning the wheel. this shoudn't be happening to car with 33,000 miles on it

 

Why haven't you taken it back to the place of service if you have all these new issues?

 

I am taking it in next Thursday. But with these incompetent dealership, if it doesn't make the noise in the shop, they usually don't have any idea what is really wrong...