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

Tiny
FONTANNA
  • MEMBER
  • 1984 MERCEDES BENZ 190E
  • 130,000 MILES
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?
Wednesday, September 21st, 2011 AT 8:55 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
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.
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Wednesday, September 21st, 2011 AT 2:42 PM

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