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O2 sensors


RavoHimself

Well-Known Member
RBV's on Boost
Joined
May 5, 2010
Messages
1,084
City
enfield, ct
Vehicle Year
2003
Transmission
Manual
how exactly do these work. do they actually "sniff" the exhaust and take a reading on O2 levels or are they heat related
 
do they actually "sniff" the exhaust and take a reading on O2 levels or are they heat related

Shortest answer is "yes".
When heated to a specific temp, the materials in the sensor produce an electric current proportional to the amount of O2 in the exhaust. This current is then read by the controller and figured into the running parameters. The parameter adjustment input happens continuously and creates a feedback loop for constant and efficient adjustment of the engine parameters (fuel volume and timing, spark timing and dwell, injection timing and dwell, etc.).

Heating is crucial, since the material doesn't start reacting to the O2 content until it is heated. This is why most modern sensors have a heater built into the device. The sensor heater turns off after the sensor is at temp. Heating will usually happen very quickly on first start.

This process also means it is important to have NO exhaust leaks before any O2 sensor. Any leaks will pull more O2 into the system, cause an incorrect input reading and can create problems like a lean run in the fuel supply, bad timing, loss of power or other problems.
 
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