My check engine light came on the day after my 2000 S430 w/ 40,000 miles on it had the B service. I assumed it was not reset after the service so I ignored it. I drive the car about once a week maybe. I live 2 hours from the Benz service dealer so its hard to just drop in. I finally got the car in this week and they said it was an O2 sensor and wanted $460 to replace it. If I understand this right it is a sensor nothing is wrong otherwise. This seems high for such an item. Is this something I should be concerned about? I know its a Benz and you pay to play in the Benz. Wondering what the experts think.

Lance S430 (in the woods in Missouri)

 

for starters your engine light has nothing to do with service. your engine light comes on because there is a problem with a emission system of your car............ now that sound like alot for 1 or sensor what is everthing they are replacing.

 

They did not replace anything because I would not agree to pay the price...I have had sensor's replaced on other vehicles in the past and the price for a sensor stunned me...

 

i have an S500 2001 model. I believe it has 4 sensors. 2 before the Cat and 2 after.

i have also read that after around 50k miles the sensors should replaced because they get a carbon build up after being bathed in exhaust gases for that period of time. I haven't done mine yet.

I have 41k miles on my car.

check out germanparts.com for the cost of the sensors..