Hello! I have a 93 190E 2.3 that has the O2 sensor light on for quite a while now. The car never stalls. I've replaced the O2 sensor, but the light is still on. Does the ECU need to be reset? Or do I need to take it to the dealer for diagnosis? Thanks for your help!

There is a small computer inside of the car that triggers this light. It can be reset Or removed. IT'S only job is to tell you to spend more money, even if the sensor is still good! MOST O2 sensors last 75-100k miles.

------------------
MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar

Thanks for the tip! Is it easy to reset or remove? I have the Haynes manual, but i haven't been able to find anything about it..thanks!!

Reset the computer by disconnect your battery, be sure you have the radio code.

jack

Jack: Thanks for the tip, but it didn't work..i took the battery off for about 15 min...still has the red light..arg! i'm about to take the bulb out of the warning light! =) i know if i take it to the shop around here, they'll tell me i just need to replace the sensor..and charge another couple hundred dollars...any other tips anyone? Thanks! =)

The computer is under a plastic cover under the passenger side carpet (floor), it looks just like fuel pump relay. has a reset button on top that can be pressed to reset. would be happy to fax info. Disconnecting battery won't reset.

M.B.DOC: Thanks for the tip! i'll try it this weekend..hopefully this will save me a couple hundred dollars of labor charges..hehe..if i run into trouble, could i trouble you for the fax? Thanks so much for your help..you guys are great!!

Jimmy

Hey MBDoc!

I sent you an email..could you fax the info about resetting the computer to me? Thanks!!