Reader Question :
I would like your honest opinion as in the past your suggestions turned valuable to repair my old Chevy. Yesterday I bought 2001 Mercedes-Benz ML320 and as soon as I drove it on the road I got the Yellow Engine Check light ON. Once it did that I could not accelerate the car faster because the rpm would not switch the gear Even though my gear was on D – Drive.
I took the car for the electronic diagnosis and the technician told me that he stored the transmission code but he said your car showed some thing know as Sporadically Rpm sensor n3y3/611 is faulty and advised me to replace them at a mechanic place. The rmp sensor goes into a loop.
After this check the Engine Check Light does not show any more. I think the technician did update or reset the computer which is why the Engine check light is not coming up again. My question is shall I drive it until the Engine light comes ON again or Shall I take it to repair center and replace the rpm sensor.
The dealer who I bought this car from yesterday told me to just drive it until I get the check engine light comes ON again.
Hello there Habib,
My honest opinion would be to take this vehicle back and get a refund immediately. I would never keep a vehicle that showed signs of trouble on the way home after the sale.
A 9 year old Mercedes……you are just asking to spend lots of money on regular maintenance let alone un-forseen problems like this.
How many 9-10 year old Mercedes do you see on the road on a daily basis vs 1-3 year old Mercedes?
Mercedes is a great vehicle, but once they start to show problems you are better off getting rid of them than dumping tons of cash into them. I would suspect this vehicle was sold because of this strange problem no one would figure out.
You are going to need to see a Mercedes mechanic who knows these cars inside and out, I am not one of those mechanics.
It does sound like a problem with the VSS (vehicle speed sensor) but that is just a wild guess.
I would NOT guess with this, the parts are too expensive. So spend the extra money and go to the dealer or find a Mercedes specific repair shop.
Maybe, if the dealership wont take the vehicle back for a full refund, they will pay the repair bill.
You can probably get your money back via the lemon law since you had an issue immediately after the sale.
I would much rather see you get out of this vehicle and into a Lexus, which is a much more reliable and economically viable maintenance wise.
Sorry to have burst your bubble. 🙁