Gomez153

i turned my car on and the check engine light came on and when i hit the gas it hesitates real bad.. i just changed the plugs and wires last wk i dont know what it is now it has 92,000 and a maf about 2000 miles ago.....man my first benz and so far a nightmareeeeeee..

Ala-benz

Check your previous work to make sure everything is hooked up right. That sounds like you have a large intake leak. Make sure that the filter box and MAF connections are solid and sealed.

E320Star

O2 sensor. If can sound from under the car, then CAT problem

Gomez153

how much is an o2 sensor? and is it easy to install?

E320Star

Not sure, usually they cost between 80 to $120 installed at a certified mechanic. I suggest u have it checked before u repair anything