yellowslk

Hey guys im at 95k now on my SLK 230. From what I understand is that O2 sensors dont really last forever. When should I replace it?

redcoupe

When you get a Check Engine light for it.

Brian_R170

It's really hard to say. Of course, as redcoupe says, if you get a check engine light, and the OBDII code indicates an Oxygen Sensor failuer, then that's a good time. However, Oxygen sensors tend to go bad slowly. I.e., their performance decreases over time. They are switches and what usually happens is that the rate at which they can switch gets slower and slower. The result is slowly decreasing fuel economy and increasing emissions, among other things. I personally change them around 60K miles, and so far, they've either failed before 60K miles or have contributed to an emissions test failer well before 60K in half of the vehicles I've owned, so 60K seems about right to me.

yellowslk

Thanks brian. Im going to replace then.

krk230

yellow slk...sorry for being off topic...but do you go to Cal Poly?...haha...I noticed that you took a pic of your car in "lot d" so I figure it's your yellow SLK I see around campus all the time...

I drive the yellow SLK230K with the SP1 AMG pack...hehe...usually park in the rideshare lot when I bring it to school...lol...but I mostly drive my black 190E...

here's a pixie...

yellowslk

yeah i do go to cal poly. I think ive seen you car too. Nice kit and wheels. I havent change much of the look of the my car but im doing supension and power plant up grades first. I just took of the body text off thats about it. And I up graded my brakes and shocks.

My name is Kris by the way.