what is the most common indicator for an O2 sensor problem.

1984 MERCEDES BENZ 190E
130,000 MILES
Avatar
FONTANNA
  • MEMBER
  • 11 POSTS
The O2 senson light has been on in my car for about 2 weeks. the car has been recertly been tuned up and is running great with the expected full economy expected. Could this be just a faulty light.?
Sep 21, 2011 at 8:55 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
The O2 sensors are designed to tell the car's computer the content of exhaust. That information is used to adjust fuel mixture. Most times, you will get a rough idle, poor fuel economy, and other driveability issues. Keep in mind, if the engine is running rich (too much fuel), it can damage other items such as the catalytic converter.

The proper way to check O2 sensors is with a live scanner that reads what is happening while the engine is running. There are perameters that the sensor must stay in.
Sep 21, 2011 at 2:42 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.